We need to make it work on the windows mobile platform. Anyone tried yet?
WiFi would basically be overkill. All the programming/processing involved in the overhead for both wifi and tcp/ip would require the module sitting in the obd II slot to have more processing power than it needs.
Also, there is a bluetooth OBD II setup already out there... see the bottom of this page:
http://www.qcontinuum.org/obdgauge/