I have thought about this too... I was originally thinking of using a USB to Ethernet adapter to network my car PC to my home PC, but after I saw a few companies at comdex, I realized USB was the way to go because:
- 100 Meter USB is now possible.
- The next level of USB, expected to be out next year sometime, will run at 400mbps which is way faster than even 100-base-T networking hardware today.
Plus I like the cool connectors USB has, and that there is high-current +5V available from the same cable!