Hi andy.
Firstly, the airvents are sealed behind the LCD screen which gives greater airflow through the side vents and floor vents. It seems to be enough for me.
The computer has gone in the car to bring it a little more up to date.
Its a touchscreen which (Currently) gives me....
GPS SatNav
GPS Speedo and Heading
Music (30Gb)
Video (30Gb) (20Gb left for system resources)
DVD Player
Bluetooth Phone Linkup (Reads addressbook from your phone on screen + Handsfree)
Broadband Internet (Will also have live webcab running onto my webpage once complete)
Next additions...
Rear view parking camera (Activated when car goes into reverse)
USB Digital to Analgue (and vise vera) dongle which will give me engine mangement details (as simple as they are!).
Solid state Hard Drive for quicker booting time (In conjunction with mini XP)
An finally, yes, the case im working on, is to fit in the storage compartment behind the drivers seat.
Thats about it.