The bicycle industry is not changing that quickly, however. Sure, I'm sure Campagnolo now has a 12 speed drivetrain with a chain made from nanotubes and Shimano probably has a derailleur that posts each gear change to Twitter, but the way parts fit together hasn't changed much in the last 20 years. You still start the bike in the same way he describes. You still inflate the tires in the same way he describes. And 99% of bikes still have the same brakes and shifting mechanisms he describes in detail. And of course, all the bikes that existed when he was alive and writing didn't magically vaporize; there are still perfectly functional bikes from the 1900s around, not to mention the 70s and 80s.
True, but one thing I can only hope we have in the future is compatibility charts like http://sheldonbrown.com/dura-ace.html#indexing and the neat rerouting trick that's described below it...
That was the first bookmark i added to my browser when i got a bike a long time ago. If you work on your own bike, and you are a geek/nerd, you will end up on this site regardless.
i'm using a lot the bicycle site at stackexchange. granted that most answers are just pointers to sheldon's site for now :)
Where I think bicycles.se tends to excel is less on the mechanical aspects of cycling and more on the technical aspects of riding. There have also been interesting discussions that are more esoteric, too, like how to get your bike on an airplane while avoiding fees.
I remember, when he was still alive, a heated flamewar would break out on Bikeforums and he'd appear out of the ether and authoritatively quash all argument with his immense knowledge. RIP
I've thought it'd be neat to turn the site into a wiki that can be maintained by bicycle enthusiasts.