87th Scale -- The definitive source for information on 1:87 (and some larger) models.
Granpajon's Display Cases -- I got all my cases from Ganpajon. Well made, and reasonably priced.
Ebbro -- the Web site for Ebbro models
Vectis Auctions -- A great way to get European cars.
Joes Diecast Shack -- Lots of information and fun.
Autocraft -- Early Dinky copies.
Doug Breithaupts -- The definitive source for information on circa 1:66 models.
Model Auto Review -- You'll be spending hours here in the archives looking up information.