Portable, Wireless File Server for the Car?
Kerhop wonders: "I'm looking to implement an off-site file storage location but want it to be convenient for me to access with the right security credentials by placing a portable file server in my car that has at 802.11b ability and is battery powered (but also recharged via cigarette lighter adapter). I've found the Sony FSV-PGX1. I am curious, though -- what solutions have others found?"
You could just use a laptop; they have everything you need, and you should be able to get something suitable for under $1000.
Archos also has a media player based on Linux with 802.11b built in (I believe it comes in 40G and 100G versions); if you want something really small, that's your best bet. But it's probably also a little more work to configure than a laptop, and not much cheaper.