Well this is my first time working with Bluetooth, so it's kind of been an 'interesting' experience to say the least.  I'm going to first plug Centrafuse (CF) again because honestly it's the best front end (GUI) I've used for the carPC environment.  Recently the CF guys have released RC3.1 and with it came a bunch of fixes and additions.

Haha!  I almost forgot, I can use my smartphone as a wireless modem for my carPC.  Sweet!

It's simple really....well...sort of.  First, I have unlimited Internet access through my cell phone.  That means, anywhere I get a digital signal from my carrier (Cingular), I can connect and access the Internet through Pocket Internet Explorer.  Now my carPC does have a wireless card installed, but I have to be within range of a wireless network in order to access the Internet.  And since my cell phone carrier has vast coverage over any open wireless networks, I can now let my carPC access the Internet from virtually anywhere.