I don't usually go to that forum, so I thought maybe many of you would miss this thread.
http://www.bikeforums.net/showthread.php?t=235328
Sheldon's journal here--scroll down for most recent update:
http://sheldonbrown.org/journal/health.html
October 25, 2006
"Saw the new neurologist this morning, the news isn't good. His opinion is that my problem is MS, of the 'primary-progressive' variety, and that the best I can hope for from treatment is to slow the decline, but that a reversal is not likely in the cards."