This project sounds promising but in the mean time I might have an alternative.
Well after blowing up one Wavefinder

and having the other blow itself up I finally gave up on them.
I have found an alternative USB DAB radio called the Trinloc MP3 Recorder for just £99.
I have one now and can report good sound qaulity and software and drivers that work on XP SP2

Couple this radio with a Blaupunkt Autofun DAB car aerial with amplifier and thats a working mobile DAB solution.
Also remember to get the SMA to BNC converter to make connecting the Blaupunkt aerial easier, however you will need to fit the BNC connector supplied with the converter to the aerials coxial. (Not difficult)
Aerial and DAB radio available from the following links:
Trinloc USB DAB Radio
Blaupunky Car Aerial with amplifier
SMA to BNC Converter (See bottom of page)
A 3v Voltage regulator capable of 3 Amps load is required to power the USB Radio. I found this voltage regulator that will fit the bill, it is variable voltage so remember to set the voltage to 3 volts first or you will fry your radio.
Variable Voltage Voltage Regulator 3 Amp load.
Now I just need some plugins to get it working with the best Carputer front ends. Apparently DABBar will support the Trinloc next release.
Hope this helps some of the other Brits on the forum, and I'll let you know how well it works if digitalWW ever send me my LCD.
Also if things look promising I could help out on software development.