It's running Eclair (2.1) and works very well rooted. Check out nookdevs "Color Nook" portal for more info. It has the Google market and most programs work fine.
There is a Froyo (2.2) build too, but its "beta" and I haven't tried it yet.
Barnes & Noble say they plan to "officially" update it to Froyo and give it the market sometime this quarter. Then we'll need to root it for Gingerbread (2.3) (grin).
Eclair doesn't have Flash but it plays MP4 at 720p. If it had a camera, it would be perfect (I don't miss 3G at all).
bryanc1, on Dec 8 2010, 09:48, said:
I'm considering getting this for my wife for Christmas and was wondering what version of the Android OS is running on here. I saw where someone had "rooted/jailbroke" it and had Angry Birds running on it, LOL.