Good Android developer books

I've been trying to get up to speed on Android and I'm going to try to list some of the better books I've come across.

1. Hello Android - Ed Burnette: This is undoubtedly the best for those like me who are cerebrally  challenged. Those who like short and really simple explanations. Its pretty basic and can get you all Androidy in no time.
2. Unlocking Android - Frank Ableson: For slightly more mature readers who can go past page 5 in one sitting. Still pretty basic though.
3. The Busy Coder's Guide to Android Development: This is more from an application perspective. Little OTT for me, but then hey, I don't judge. My mental maturity is questioned by most people.

 There's of course millions of links and resources on the WWW. http://developer.android.com/index.html is great for the nitty gritty. Ok, that's about as much I can write about geeky stuff before i drop off...