random.org

RANDOM.ORG offers true random numbers to anyone on the Internet. The randomness comes from atmospheric noise, which for many purposes is better than the pseudo-random number algorithms typically used in computer programs. People use the numbers to run lotteries, draws and sweepstakes and for their games and gambling sites. Scientists use them for random sampling and as input to modelling and simulation applications. Artists use them to make art and music. The service has been operating since 1998.

http://random.org