I saw on another forum that Sheldon's archives will continue. His pages are an invaluable resource to any DIY bike tinkerer.
The Harris Cyclery store was quite the haul for me, or at least was inconvenient, so I never went there.
And, frankly, thanks in large part to Sheldon's pages, the number of reasons I have to go to a bike shop these days for mechanical assistance are few and far between.
I met Sheldon briefly once on a local bike club ride. Any photo you see of him online shows his helmet adorned with an eagle sculpture of some sort, so he was pretty instantly recognizable.