Unfortunately, Blogger shrunk the picture for some reason, so head on over to Mashable to see it in all of its glory. My favorites of the bunch are Doc Ock's Superior, Miles', the 2099, the black costume (not the movie version, fuck that), and the Ditko and Romita, Jr. versions. Least favorite is the Scarlet Spider II (too.much.red.), and the two costumes from the Raimi movies. Really liked the movies, but was never keen on the raised webbing details.
h/t The Mind of Morgan.