Google just dropped a bomb on the official Android blog moments ago: Android Device Manager, a tool to help locate your lost phone. It's simple - you can track your phone from a web interface (or the official Android app!), and then ring or wipe it. Simple? Yes. Absolutely something we've all wanted since, I don't know, ever on Android as a standard feature? Duh.
Android device manager will be part of - you guessed it - Google Play [Services]. Google says the feature will be available "later this month," and the fact that it's compatible with Android 2.2 or higher would seem to indicate this is going to be widely available. Let's hope so.