I just found this on Fleabay: http://cgi.ebay.com/ebaymotors/WIRELESS-BLUETOOTH-OBD-2-OBD2-ODB-II-INTERFACE-SCANTOOL_W0QQcmdZViewItemQQ_trksidZp3286Q2em63Q2el1177QQhashZitem563360f324QQitemZ370229179172QQptZMotorsQ5fAutomotiveQ5fTools
It plugs into your ODB2 port and has a bluetooth transceiver.
You can then use this program: http://www.ipmart-forum.com/showthread.php?t=393427 to interface with the module on a Nokia Symbian based phone. With an N97 or 5800 and its huge 3.5" screen mounted in a car cradle, this seems to be a really cheap alternative to other products???