Are there any limitations to the Cappuccino pc? You can get an on-board soundcard that will put out 5.1 but since, from my understanding, the cappuccino doesn't have room for on-board, you can use the usb soundblaster live. It's pretty popular around here. I was actually using it for a while but switched to on-board. Been meaning to sell it but I've just been lazy.
http://www.soundblaster.com/products...&product=10702
As far as internet, you can go with wireless which would pick up signals whenever you're in range of wifi or you can go with one of the cell provider's evdo such services. There's even a product out there that you can plug an evdo card into it and it's a wireless router in your car. (unlimited data from a service provider is about $20 a month)