IIRC the name of the place to check is called cyclegadgets.com

They make a basic (actually several) base mount that can be modded to accept phones, radar detectors, gps, pda, balckberry, blueberry...dang they prolly got something to hold a hamburger for ya! :D

This is quality stuff that is purpose built for motorcycles.

El Linko!

http://www.cyclegadgets.com/