There is a free app in the Android Marketplace called ‘Wheres My Droid’ that you really need to get.
Once you install, configure and enable the app, it lets you find your phone when it’s lost! Even when it’s stolen!
Can’t find your phone? go to www.wheresmydroid.com and you’ll be able to start it ringing even if you have the volume off.
Then, from the same website, you can do a GPS search for your phone that will return longitude and latitude and show your phone’s exact location on a Google Map.
And, if your phone is unrecoverable for some reason (maybe you just don’t want to go into that Crack House to confront the bad guys), there is an option to ‘Wipe’ your phone so that your personal data is vaporized!
Now THIS is cool!