Adaptoid
 

has anyone tried using this USB connecter ??

its awsome , can use the N64 controller on your computer, and works and feels exactly the same, the joystick part of the N64 controller has 150 movements, can walk slow or run slow, if use a regular controler i believe it would just go all at one speed.

http://www.adaptoid.com/

says that it can be rumbel pack compatible and the pokemon transferpack compatible too