Wow, this is an amazing coincidence. I'm sure you were just about to give up hope on this idea. I'd read your post and was just talking with a friend of mine who had heard of this company, ViaSat, that produces such a device. So here's a link to the
ViaSat MiniDAT. I don't know anything about it or what it's limitations are, but at least it's a start! Looks pretty nifty to me.
Russell
Applications Engineer
National Instruments
http://www.ni.com/support