We here at TUAW are big fans of Twitter, the simple web service that asks, 'What are you doing?' It is pointless, it is a time waster, but above all it is lots of fun. Gordon Meyer over at the Mac DevCenter seems to like Twitter as well, but he seems to be on a quest to make it useful. This article explains how he is using some home automation software, a dash of Applescript, and Twitter to enable his house to let him know when a number of things happen.
I'll just continue having fun on Twitter, but I encourage others to hack away.