Coastaletech make a bunch of adaptors to add video to various factory navigation sysytems.
They also make a piece that allows you to add an aftermarket bluetooth to the Onstar system.
At $99 it looks like I'm ordering one as soon as they start shipping them again. I carry the Parrot bluetooth kits at the stereo shop I help out at. The one we have has a color picture ID screen on it. They also make on that has a bluetooth GPS with it to tie to your cellphone. I am runing TOMTOM navigation on my Cingular ( AT&T) 8525.
The link below has a video demo of the unit.

http://www.coastaletech.com/ONSTAR.htm

GM ONSTAR LOCKPICK

UNLOCK YOUR ONSTAR
AND
USE IT FOR INTEGRATION OF YOUR
AFTERMARKET BLUETOOTH HANDFREE PHONE KIT!!!
WORKS WITH LATEST MODEL GM VEHICLES!!!
FULLY INTEGRATE YOUR AFTERMARKET HANDS FREE KIT
TURN ON ONSTAR FOR YOUR OWN CELL PHONE KIT
(COMPATIBLE WITH PARROT, MOTOROLA, AND OTHER UNIVERSAL BLUETOOTH HANDS FREE CELL PHONE KITS)
$99.00

Note: ONSTAR Lockpicks are currently on backorder
approx.4 wks for shipments on ONSTAR Lockpicks
SUPER GM LOCKPICKS AVAILABLE which have ONSTAR FUNCTIONS
CLICK HERE FOR SUPER GM LOCKPICK

ACTIVATED BY MUTE FUNCTION OF AFTERMARKET HANDS FREE KITS
- WHEN CALL IS RECEIVED, FACTORY RADIO WILL AUTOMATICALLY SWITCH TO ONSTAR WITH SOUND FROM YOUR BLUETOOTH CELL PHONE KIT!!
FULLY COMPATIBLE WITH ONSTAR EQUIPPED VEHICLES

- NO LOSS OF ONSTAR FUNCTION!!
FULLY COMPATIBLE WITH VEHICLES NOT EQUIPPED WITH ONSTAR

- THE ONSTAR LOCKPICK KIT WILL PROVIDE ALL NECESSARY COMMUNICATION!!
UNIT HAS ACCESSORY POWER OUTPUT TO SUPPLY POWER FOR YOUR HANDS FREE KIT

- POWER WILL TURN ON AND OFF WITH IGNITION KEY OPERATION!!
ONE LOCKPICK INTERFACE FOR MILLIONS OF GM VEHICLES
- 2004-2007 MALIBU, 2005-2007 COBALT, 2006-2007 HHR, 2006-2007 MONTE CARLO, 2006-2007 SATURN ION, 2007 AVALANCHE, SUBURBAN, EQUINOX, TAHOE, YUKON, DENALI
- 2007 CADILLAC ESCALADE
- 2004-2007 G6, 2007 PONTIAC G3, G5, 2006-2007 SOLSTICE, 2006-2007 TORRENT
- 2006-2007 SATURN VUE, 2007 SKYE, 2007 ION, 2007 AURA
SHIPPED WITH SIMPLE PLUG-IN CABLES FOR 2007 GEN 3 LOCKPICK COMPATIBLE GM VEHICLES
- NO NEED TO CUT OR SPLICE WIRES TO CONNECT TO YOUR GM, JUST PLUG IT IN !!

 

do they make a dvd decoder for the stock nav on a 07 h2?