i live in india and over here, we dont have much access to too many books. but out of the one that are available here, i like Inside Maya 5 (i know its not Maya 6 but, that's what's available here). it has got some good stuff. though it doesn't cover everything. i don't think any book would.
i found a good book on the net. its on character modeling and animation by a guy called Jae Jin Choi. seemed to be good. i don't have it. not available here.