from today's RBR newsletter:
Shimano Corporation is recalling about 5,000 front quick-release skewers. Shimano says that after the QR is locked into position, the skewer could spontaneously break. Silver-colored QR skewers purchased or received after Nov. 1, 2005, are affected. Not being recalled are black skewers or those that have a small round sticker on the back of the lever. The recall affects Shimano 105, Ultegra, Dura-Ace, XT and XTR hubs, and Dura-Ace front wheels, including some Sport Dynamo hubs. According to the trade publication Bicycle Retailer and Industry News, Shimano will send a letter to retailers by May 31 with plans for replacing affected front skewers. Check with a Shimano dealer then if you have a suspect QR. In the meantime, stop riding with it[