I just skimmed through the thread, so I don't know if someone mentioned this already. How about trying http://code.google.com/p/tinkerit/wiki/TrueRandom. They claim that it is very random. It uses analog input A0, and some other stuff.
Entropy = 6.440816 bits per byte. Optimum compression would reduce the sizeof this 1,002,424 byte file by 19.49% Chi square distribution for 1,002,424 samples is 4802982.71, and randomlywould exceed this value 0.00% percent of the time. Arithetic mean value of data bytes is 100.3535 (127.5 = random)Serial correlation coefficient is 0.042774 (totally uncorrelated = 0.0).