Here's a VERY expensive way to do it:
iPhone Car Kit
Im Thinking of doin this to my WP, cause we dont have USB or Bluetooth connectivity for our headunits....
WP & WQ Drivers need these mounts:
WP Mount
WQ Mount
Holder/Cradle
Plus we need this headunit : Alpine CDE-103EBT (about $320)
But for guys wit the a WS Fez:
Mount
Holder/Cradle
More Holder/Cradle Options