Andrew Bird looks interesting...
If you ever get the chance to see
That One Guy don't miss him. He plays an intrument that he built... it's some sort of huge pipe with all sorts of knobs and buttons and strings attached. I really have no idea how he plays this thing but it's really creative. Here's a youtube clip of him. It starts getting cool toward the end...
http://www.youtube.com/watch?v=t2EhMtD_09k
edit: he loops stuff