[dave_au]

I made something like this myself a while ago, albeit much simpler, for some crazy project. Generated a couple of CDs of data in not very long - the RS232 link was the bootleneck.

A couple of good links for those that want to give it a try:

http://robseward.com/misc/RNG2/

http://www.cryogenius.com/hardware/rng/

I lost track of the actual links that I used but it's all roughly the same principle. One of the links I lost track of had a paper describing how random avalanche noise is, had some favourable things to say.