RemoteX is a remote controller for iPhone/iPod touch, which enables PC to become a simple home appliance. Now, you can shut on the PC while comfortably sitting or lying, and shut it down and sleep after enjoying the music and video. -- http://www.peepleware.com/index.php?product=remotex
I've been rocking it for about a week now, and the the app seems faultless, apart from when you leave the app, and go back into it again, the connection to the server seems to drop and you have to manually reconnect to the server. The animations are little bit slow and annoying, not to mention meaningless.