Eubanks Software has just released the beta for I'm Home for Android, an app that alerts family and friends once you reach a certain destination to keep them from worrying if you forget to call them.
From the the developer's site:
"'I'm Home' for android uses GPS or network location services to alert family and friends when you reach a preset destination. If you've ever forgotten to call someone when you're on a trip away from home you know how valuable this application can be. Never forget again, let I'm Home send an automatic text message for you!
I'm Home is currently in beta testing but is on the android market in both free and donate (paid) versions. Please support our development and promote faster releases by donating. (People who purchase the donation beta will receive free updates when the final release is ready.)"