I am sad this morning to hear on the lists that Sheldon Brown has died overnight. He was 64. There is some more information at http://bikeportland.org/2008/02/04/sheldon-brown-rip-1944-2008/ .
Sheldon Brown's encyclopedic website on bicycles and maintenance was my primary reference tool for the Apollogy project and my burgeoning fixie consciousness amongst many other things. It was also often very funny.
My thoughts go to his friends and family at this sad time.