Windows only: We've shown you how to shut down your <a href="http://www.lifehacker.com.au/2008/05/shutdown_windows_with_a_text_message_thunderbird_edition-2/PC and Mac with a text message, now you can control your PC from afar using a Twitter account.
TweetMyPC uses the Twitter network network to relay command messages to your PC. You install the tiny application, give it the credentials of a Twitter account you've set up for the purpose, and from there it checks the feed of the control account every minute. Anytime the feed account Twitters the following commands: Shutdown, Restart, or Logoff, then TweetMyPC performs the following command on your computer. TweetMyPC is freeware, Windows only and requires .NET 3.5 or higher. TweetMyPC [via gHacks]