I've bought Professional Android 2 Application Development by Reto Meier this evening and costs S$55 (after 20% discount). I felt like myself to buy this book when I saw at book shop after reviewing the main content. Because it covers based-features of Android and found a lot of useful information of Android as well. And it covers the functions which I want to know like SMS, working in background, audio and video features.
Hope it would be worth.