Since I finally found the opportunity to have a look at some Google IO 2011 sessions, here are some links to sessions I can recommend:
Android Development Tools:
Shows some neat tips & tricks for using new (and old) features of the ADT plugin for Eclipse
Android Protips: Advanced Topics for Expert Android App Developers
Provides a lot of great tips and some patterns for common problems, e.g. keeping backward compatibility while still using new features, doing battery efficient data updates, etc.
Memory management for Android Apps
Background information about the garbage collector, memory management in the Dalvik VM and how to find memory problems by using the Eclipse Memory Analyzer
Building Aggressively Compatible Android Games
A good high-level summary of how to make apps compatible for many devices.