Roomba, base it on Arduino, or make it tweet. Do all three and, well, you've got a nerdgasm-inducing bit of Make fodder. The creation you see above is a web-controlled tweeting Roomba whipped up by Instructables member matchlighter using a 500 series vacuum bot and the Sparkfun WiFly shield for Arduino. The autonomous cleaner can be triggered from anywhere there's an internet connection and updates Twitter to keep you abreast of its status (Ahh! Dock sweet dock). While Mr. matchlighter was kind enough provide directions for building your own,
Update: The complete code is in step eight of the Instructable.