Bikes that have braze-ons for racks, fenders, frame pumps.

Also rack, panniers, lights, rain capes, spats, Brooks saddles, wide/slick (Schwalbe) tires in both 700c and 26" sizes, handlebar bags, etc.

Few shops accomodate commuters with stock items, but many will order if you know exactly what you want. But that's what the internet is for. I want to touch and feel items in my LBS, and then I'll buy from them.