cliric, not sure about the usb-if. i dont think its standard wireless usb (as discussed earlier in this forum), but i would give dell a call and see what they can do.
a new piece of info for ya'll, on my packign slip it says that i ordered:
item CX071: Kit,Remote Control,RMT5,Dell Americas Organization Dimension
maybe see if you can order CX071 and/or RMT5. if it costs something like 11.99, then that is probably it. good luck again.