Can someone please explain the Riemann Hypothesis to me... in English? I've read so much about it but none of it makes a lot of sense. Also, what's so unsolvable about it?

In very layman's terms it states that there is some order in the distribution of the primes (which seem to occur totally chaotic at first sight). Or to say it like Shakespeare: "Though this be madness, yet there is method in 't."
If you want to know more there is a new trilogy about that topic where the first volume has just arrived:
http://www.secretsofcreation.com/volume1.html
It is a marvelous and easy to understand book from a number theorist who knows his stuff! 
