TUAW: Control another Mac with iChat and AppleScript. I haven’t tested this, but I like that they include an AppleScript to control iTunes remotely — a functionality that’s long been missing (I’d argue that remote control is more relevant to home usage than sharing music libraries). It’s fun and weird to see it appear via IM bot.
It’s not so fun on the other hand that you apparently have to select a freaking AppleScript in your preferences if you want to have iChat open a chat window (rather than the stupid notice you have to click on) when you get a new message. Unless I’m missing something.