I just added Lava Lamp support to BuildbotIcon using the Phidgets USB interface kit. (Bought from Active-Robots UK)
Can't wait to have it going in the office. I've got the code running, but I need some casing and wiring for it to be safe to connect to the 220V outlet.
If you like it, click here:
Of course, it's nothing compared to Last.FM's setup but you have to start somewhere. :)