The rules are based on the OS version. There are some differences for 3.0, but in this case 2.1/2.2 doesn't officially support tablets at all so there weren't a

The rules are based on the OS version. There are some differences for 3.0, but in this case 2.1/2.2 doesn't officially support tablets at all so there weren't any exceptions. Froyo did require a camera, and the four android buttons - I don't think the nook has those either.