Man, I've been praying someone would make a PS2 controller adapter for 360 ever since DDR Universe was announced. Today I see that these shipped out this week:
http://www.xbox-scene.com/xbox1data/...EZdrrNQpqZ.php
http://www.teamxtender.com/
It's pretty expensive ($80) but it looks like you can use just about everything with it: light guns, racing wheels, dance mats, and guitar controllers.
It isn't a MS licensed product, so I have no idea how they can get these to work on a 360. Maybe they use chips from original 360 controllers? If so, that explains the high price. Either way, I'm totally buying one so I can use my cobalt flux in Universe. Soft pads suck!