CNN.com is reporting that Tiger Woods is done for the season. Their article links to Golf.com's article:

Tiger Woods will miss the rest of the season because of surgery to repair a torn ligament in his left knee, an injury he has been dealing with the last 10 months despite winning nine of 12 tournaments.

Woods also said he suffered a double stress fracture of his left tibia while preparing to return to the PGA Tour last month, which forced him to miss the Memorial and was the source of his pain at Torrey Pines when he won the U.S. Open.

Continues at Golf.com: Tiger will miss the rest of the season | Tours & News | Golf.com