What is the most secure seed for random number generation?

Question

What are the most secure sources of entropy to seed a random number generator? This question is language and platform independent and applies to any machine on a network.

Answer 1

Random.org offers a true random number generator web service, "seeded" by the atmospheric noise.

You get 200,000 random bits for free each day, up to the 1 million random bits cap after that you should top up your account, it gets as cheap as 4 million bits per dollar.