Where is the fun in playing games from Xbox Live Arcade without a real, traditional arcade style joystick. Frogger with a d-pad? Are you kidding me? A "junior member" on the arcade controls forum managed to piece together an arcade style controller for his Xbox 360 ... a wireless arcade style controller.
Basically he purchased a new wireless controller and used some crazy ass wiring to rig it up to a joystick and some buttons. It may be a bit on the large size, but I am still very much impressed, especially with the ballsy wiring job going on.