According to a message posted on the Touring e-mail list, Sheldon Brown died of a heart attack last night. Brown is best known for his informative Web site, and I hope someone will continue to host it in his memory (like Ken Kifer's site). A visit to sheldonbrown.com is like sitting down with a friendly mechanic and picking his brain over beers. It's easy to lose track of time and spend hours reading all the material.
Brown was always a welcome presence on the Touring list, whether for his detailed knowledge of bicycles or his sense of humor evident in annual April Fool's Day products such as the Real MAN saddle made of granite. How many bike mechanics are listed on Wikipedia? There might be someone out there who knows more about bicycles, but I doubt there is anyone who has shared so much of that knowledge freely with others.