Android Patterns does a good job of presenting the basics. I have the HTC Evo and the Android 2.0 software beats anything else I've ever used. The top 3 rated

Android Patterns does a good job of presenting the basics. I have the HTC Evo and the Android 2.0 software beats anything else I've ever used. The top 3 rated phones on PCworld are all ran by Android 2.0 software (with iPhone coming in fourth place). Also, for all you app developers out there, development in 2.0 is your best bet. Androids still have less apps out there compared with iPhone OS at this stage, so you'll have a little less competition to deal with.