Software to run on, or interact with, the Android operating system. For non-recommendation questions, please ask on android.stackexchange.com, or stackoverflow.com for programming Android applications.
Android is an operating system for smart phones and other mobile devices. Primarily controlled, developed, and distributed by Google Inc., Android is an open-source operating system based on a modified version of the Linux kernel.
Android Enthusiasts StackExchange
For user questions.
For developer questions.
Android page on Wikipedia
Detailed information about Android.
General information about Android.
Google I/O developer conference
Contains detailed videos and slides by Android product engineers.