Grischuk upsets top seed Aronian, and Kramnik somehow survives against Radjabov. English-language coverage is spotty at best: I'll add links later today. In the meantime, here's an English translation of Shipov's commentary on yesterday's Topalov-Kamsky game.
Semifinals pairings: Kamsky (USA) vs. Gelfand (Israel), and Kramnik (Russia) vs. Grischuk (Russia). Play begins this Thursday. The survivor will challenge Vishy Anand for the world title next year.