Nine
Bianchi w/ Centaur (double)
Plain-wrap frame with Veloce (triple)
Trek 520 (touring)
Bianchi Volpe (light touring/cross)
Bianchi Pista (fixed)
Fisher mountain bike
Santana tandem
1956 Schwinn Corvette
Breezer Citizen (grocery getter)
I have quite an inventory of parts. Like about 5 cranksets, some chainrings, 5 cassettes, 4 or 5 chains, enough cables and housing for life, 2 spare sets of Centaur shifters. About 20 tires. Saddles, seat posts, stems, handlebars. I do all my own maintenance and whenever I see good prices on parts that I will need someday, I just buy them.
I do enjoy tinkering with the bikes almost as much as riding.