The big news: Carlsen, who's taking a breather this year, will play in 2011! (Somehow, Carlsen is beginning to make a Fischeresque imprint on the game: he's the biggest presence even when he's not playing.)
The Ciudad de Linares tournament has been the unofficial tournament championship for over two decades. This year's event is shorter and somewhat weaker, but any event with Aronian, Topalov, Gashimov, Grischuk, Gelfand, and Vallejo is still incredibly strong.
Topalov and Grischuk lead with +1 after 3 rounds. Let's catch up via ChessBase: