Another OBD reader - but this has bluetooth!
 

Saw it advertised in the back of this months Evo.

£99 for a Bluetooth OBD reader - so no nasty wires hanging around, plus it has the software included to display it on almost anything - including your java-capable mobile phone! (Okay - that bit is kinda pointless, but amusing in a pub carpark kinda way)

Was thinking about just ordering a cable from the states and downloading some free software thats available until I saw this - but the bluetooth is a pretty convincing selling point for me!

OBDKey. Automotive Scan Tool Products.

I have a laptop cable, so the windows mobile software would be VERY useful, shame you can't buy it separately