ChessEnthusiast is a Nook Chess App I bought a few weeks ago for a dollar. After downloading it I found I had the same problems that the reviewers had in that it wouldn't move...it just sat there and did nothing. I changed engines and tweaked the time controls and that's when I discovered I have an app on my Nook that I can't beat!
It has a lot of features but the main thing is the engines, “Shitoku+” and “Cockatoo” (sound nasty, don't they?). I could not find either engine listed when I Googled them and when analyzing the below game with Houdini on the Fritz interface I noticed that the Cockatoo engine played not too differently from Houdini. It makes me think the app's engines may be plagarized and renamed, but I don't know. You can read a complete review of the app on my book review blog. Here's a game I played against it.