I've added an Ethernet Shield to the Arduino that controls my egg-timer based RNG.
It's logging about 52kb per second (420000 bits per second or thereabouts) over a UDP port to my clunky old Acer netbook running CrunchBang linux (which is an awesome OS by the way).
I used "netcat" (a standard linux tool) to dump the raw binary UDP packets to a file on the linux box's hard disk for later analysis. I tested a 300kb file of random garbage against a few of the DieHarder tests.
It's passed the small number of tests I've subjected it to so far.
I'll flog it a bit more and see if I can get the high score higher than 5%.
But a pass is a pass, right?