TweetMyMac allows you to control your Mac remotely by sending DMs to an account you set up just for controlling your Mac. You can get iSight snapshots, screenshots and your IP address, as well as shutting down your Mac and more.

note: 9/10 - app is down with with oAuth

Platforms: 

Tool Reviews

Reviewed on September 10, 2010
4

The developers apparently abandoned this app until forcibly reminded of it by the OAuth-pocalypse and finally issued an update. With that update, the app works again and as advertised.