With the release of Android 4.0 (Ice Cream Sandwich) the new Android design language ”holo” has been introduced. The following list highlights a few resources that either showcase great holo styled apps or focus on the holo design process.
Most of the resources also have an active community on Google+, so a link is added when available.
developer.android.com/design - The official website of the android style guide.
Android design in action [g+] - The “official” Google Developers Live show for Android design. The weekly show features app redesigns, usability patterns and best practices when designing for multiple screen sizes.
Asset Studio - An online tool to create graphics and other UI artifacts for Android applications.
Android design community on Google+ - A (still young) community of people discussing Android design.
Do you know of other Android design resources? Let me know.