TweetMyPC is an application which will allow you to Shutdown/Restart/Log off  you Computer using your twitter account.

This application can be downloaded from the codeplex

It will be better to create a twitter account to do this. When you want to shutdown, restart or logoff your computer, just login to the Twitter account and post a new Tweet (Shutdown, Restart, Logoff). Tweet should be exactly like this, since it is case sensitive.

This is an open source project, you can download the source code from here

[Via gHacks]