They updated the OS for the Nook HD and Nook HD+ a few weeks ago and boy, what a difference does it make! These devices are no longer jailed to the Barnes & Noble's experience with their nascent App Store, but instead they are open to the entire Google Play infrastructure.

I've had an on-again/off-again love affair with the Nook series of eBook readers. I started with the Simple Touch and that lasted until the devices page turning buttons started going “hard of hearing” and I stopped using the device to read books when paging through became a maybe-yes/maybe-no proposition. I upgraded to the Nook HD, which is the smaller model that they offer and the HD+ is the iPad size model. The Nook has a bunch of really great features going for it, like having a place to insert a MicroSD card so getting a device with a big amount of internal memory is really quite meaningless, the bargain-basement model is good enough as the material that eats up the most space can be easily stored on the MicroSD card.

The challenge to really loving the Nook wasn't about the device itself, the device itself is built very well, almost Apple well, it's reliable and is smartly designed. The challenge I have always had with my Nook was the eBook reader software that B&N ships with their stock Nook devices. Please do not misunderstand, the app itself is exceptionally good if you are a general user, someone unlike me who is perfectly fine with the certainly competent eBook reader app. I however was not fine with the app. It came down to being ever so slightly irritated at certain little niggling issues that while I was using the device would wear me down. It's like having a very small pebble stuck in your shoe – you can walk without a problem, you don't limp at all, but you know there is a rock in there and over a long period of time it just irritates you and makes everything just a little less “right”. This stock app lacked some features which I really wanted. The primary feature was having the ability to configure the reader to use the font I prefer to have my eBooks rendered as. I have fonts I really find easy to read, those are OpenSans from Google and Helvetica Neue from Adobe. This was the little pebble in my shoe.

Then B&N let go of their Nook devices and upgraded them all to full Android devices that could use the Google Play Store as well as the B&N App Store. That night, after downloading the update and starting my Nook HD with this brave new world running on it I discovered just how incredible my Nook HD could be, freed. I found, bought, and installed a new eBook reader called Moon+ Reader Pro. The cost of the app wasn't too bad, at $4.99, it had a free version which gave you a taste of much of it's great features and once I saw just how perfect a match this eBook reader was for me I decided that I could spend the money on the full-blown app. This one app makes my Nook HD awesome as an eBook reader, and here is why:

• Custom Fonts (!) – This was exactly what I wanted all along! It turns out that Helvetica Neue has a labyrinthine licensing model so I gave up on that font but instead switched over to my other favorite, Google's OpenSans. This font is freely available and it wasn't hard at all to find it as a “TrueType Font”, aka a TTF Font version. I copied the TTF Font file to my Dropbox and used another great Nook HD/Google Play app called File Manager HD to copy the file out of my Dropbox and create a folder for it in my Nook HD's file system called “Fonts” and copy the TTF Font file there. In Moon+ it was a cakewalk to navigate to my new Fonts folder, find OpenSans and that was it. Every eBook now is rendered in OpenSans, the way I really really like it to be.

• Adjustable screen brightness with a swipe and font size adjustment by swipe – This actually wasn't something I thought I would really need until I found myself using it a lot. It's quite handy to skip out on having to adjust settings when trying to find the right font size and brightness to suit your reading preferences.

• BookPlay – It's a feature of Moon+ where you can play a book, it slowly (with an adjustable speed) advances the lines of an eBook smoothly while your eyes fixate at the center of the screen and you don't have to paginate at all. The book automatically, slowly, smoothly advances along like a scroll attached to an adjustable winding player. I don't really know what the feature is called, but I call it BookPlay, and it's nice when I don't want to tappa-tappa to advance eBook pages on my Nook HD. The speed of advancement can also be set to a swipe adjustment, which I find to be really quite handy and super-clever.

• Many canned custom themes and theme colors – You can configure the Moon+ app to switch display themes with all the settings saved per theme or turn off everything but color changing so the theme selection system does double-duty as a screen color picker. Sometimes I like reading black text on white backgrounds. Sometimes yellow text on a textured blue background and sometimes dark blue text on a black background. Each color theme is useful for different reading conditions. It's nice to be able to set my Nook HD to it's brightest highest contrast black-on-white for reading outside or on the bus on my way to work, then to the yellow/blue one for leisurely reading at home and then the dark blue on black to read in bed without staring at what amounts to a flashlight in the shape of a tablet.

• Formats? Every format! – I have a few books in the B&N Store that I “bought” because they were “Free Friday eBook deals” that I took B&N up on when the opportunity struck. For those books I will gladly go back to the B&N canned eBook reading software and that's fine for those books. In general however I prefer to obtain my eBooks in the ePub file format. To that end, I have all my ePub books loaded on my MicroSD card, so they don't take up space on my Nook HD. Moon+ has a great bookshelf organizing metaphor and installing books that are stored on my MicroSD is a cakewalk. I love having all of my eBooks available and here's something that I've always been a little grumped about when it comes to the canned B&N eBook reader app, and that is, you have to get your books from B&N to have them in the B&N “Locker” so that you can make use of the “magic bookmarks” so you can pick up your eBooks on any device and read and when you stop that new place where you stopped is synchronized across all your B&N connected Nook apps and devices. This is really quite nice, especially when you have multiple devices or one of your devices has an exhausted battery but you don't want to stop reading your eBooks. There is no way to import your own ePub files into this B&N “Locker” system so you're shit out of luck. Moon+ returns this feature and makes it more generalized, open, and way more convenient. You can set up your “magic bookmark” sync with your Dropbox account! That's the way to do it! Have individual ePub files on Dropbox or on a device and use Dropbox to store the tokens needed to make the “magic bookmark” feature work without having to rely on the closed garden that B&N provides! This is so cake and eat it too, and I love crowing about that sort of thing when I discover it.

• Reading Statistics – Moon+ also watches you read as you use the app and records your reading speed, how quickly you read books, and it also includes per-chapter ETA so you know generally speaking how long you have left in the chapter you are currently reading and a per-book ETA to let you know how much longer the book will last if your reading rate is constant. If you slow down or speed up, these values change and you can display them on a very thin status bar that is always visible at the bottom of your eBook screen. This little status bar can also display your battery level in your Nook, so you know how much juice you have left before you have to plug your Nook back in and charge it up. It's wonderful, for example, while reading “The Adventures of Sherlock Holmes” to know that the chapter you are currently reading has only 15 minutes left in it. That is quite a nice feature.

• Access to Project Gutenberg – Moon+ makes it easy to connect itself to the largest collection of publicly accessible eBooks in the world. Project Gutenberg scans public domain books, lots of classics really, into ePub format and makes them freely available online. Moon+ has a interface to Project Gutenberg so the entire archive is just a few taps away and you can download your eBook right to your Nook and start enjoying reading, without having to pay one red cent.

All in all, for $4.99 Moon+ is a steal and makes the Nook HD a wonderful eBook reader. Moon+ has single-appedly eliminated any desire I had for the iPad Mini. That Moon+ only exists in the Android marketplace (Google Play) makes this one app the central pillar that tilts the playing field in favor of B&N and Android when it comes to tablets and reading eBooks. The iBook app for the Apple infrastructure is still quite good, as much as the B&N canned eBook app is for the Nooks themselves, but Moon+ blows it's competitors out of the water.