Why not just install a 3G-enabled iPad? You get iTunes (controllable via your steering wheel), Pandora (also controllable via your steering wheel -- I have no idea how they did this, but hitting the up button on the left side of the wheel advances a track in Pandora!!), awesome stereo-integrated GPS (there are many excellent packages available for the iPad, and you can get traffic for just a few bucks), email, web browser, you can play videos, you can even get Skype with video. There's no cutting or custom installation whatsoever. It takes all of 15 minutes, working slowly, to install. There's just the one plug that handles power and audio (I used an old DiceLink box, but you could use the newer version they sell at places like bavsound.com, and, if your car doesn't have it but you want it, they have one with Bluetooth). There's no need to relocate the computer display to the glove box or anything like that. You even get, whether with iTunes or Pandora, the name of the song that's current playing listed on the bottom of the instrument cluster.

I am just not clear on why you guys are working so hard to install a system that is so much less capable than simply using an iPad. Mine is the old type, but an iPad2 would be even cooler because they are a little smaller and lighter. Of course you could use other tablets too -- I just happened to have a DiceLink and an iPad already.

Just an idea. Telling you, it couldn't be simpler and you get loads and loads and loads of functionality.

I am sure you could find an even better way to do this; the DiceLink I have is several years old and it's just a first-gen iPad. But it certainly works.