PC Magazine has published a fun article detailing the top 10 weirdest game controllers (the new 360 keyboard is in there).
Ranging from the monumental (Force Dynamics’ 301) to the silly (USB finger dancemat anyone?), my personal favourite is the bodieLobus Paradox. A PS2 gamepad with a trackball where one of the mushroom sticks should be. I may be tempted to get one, I don’t own a PS2 but it comes with a USB adapter so you can use it with a PC. (From PC Magazine.)