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'm using a lot the bicycle site at stackexchange. granted that most answers are just pointers to sheldon's site for now :)