When the alarm is triggered, it turns the empeg on and plays "Help! I'm being stolen" repetitively at ear-drum splitting levels, or alternatively plays 'I should be so lucky' by Kylie Minogue, at said levels, which should be enough to drive the would-be thief insane.

I love it. But does it only play "I'm being stolen" until it is pulled from the sled?

The alarm is key-locked with a crytpo iButton

The iButton seems like the trick. What's the range on the readers, though (and the power consumption)? Would having an iButton on your key ring (in the ignition) be close enough to activate through a sensor in the display module?

Oh, an integrated GPS, OBD, radar detector, and a CF or SDcard slot for live data logging would also be nice.

Everybody gets to take a whack at their own fantasy/ideal. I'm not sure mine would extend to integrating every possible function into a single box (like GPS or Radar detector). My ideal wouldn't have those but would emphasize interfaces and modularity -- make it easy to add them (I didn't want to burden the Guys with with recreating a V1!)

I *dooo* like the CF slot!