Timothy Gowers just announced that Endre Szemerédi has been awarded the Abel Prize for 2012. The citation reads:
"for his fundamental contributions to discrete mathematics and theoretical computer science, and in recognition of the profound and lasting impact of these contributions on additive number theory and ergodic theory."
This is a truly major day for discrete mathematics and TCS. Look at the Abel Prize web site and at the written version of the talk by Timothy Gowers, addressed to a general audience, for more details.