Are you riding Shimano wheels? This may be of interest to you.
Raleigh
---Citing a "potential safety concern," 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.