ThingSpeak has just released a new app called TweetControl that listens to Twitter for hashtags and allows you to control anything you want. The documentation for TweetControl is available on the ThingSpeak Community site.
Excellent! This is just in time for the Instructables Make It Tweet Challenge!
Via ThingSpeak Blog

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#whatcouldpossiblygowrong
Comment by Greg Courville — May 31, 2011 @ 1:06 pm
Twitter goes down again => nuclear plant melts down.
Comment by Drone — June 1, 2011 @ 6:48 am