Red trike (first I can remember)
6-7 years old: dark green Schwinn banana seat bike with pink streamers
8-10: White Jacques Anquetil children's bike from France (beautiful; still have it)
12-14: Red Line BMX bike
15-12: Univega Gran Tourismo (for my teenage bike trip across France)
18: Fuji racing bike (stolen several months later)
18: Specialized Stumpjumper Mountain Bike (still have that one, too)
20-23: Centurion racing bike
21: Bridgestone MB2 mountain bike that I still have
21: Vitus 979 racing bike (21 was a good year, I guess!)

no new bikes for a while, just rode the ones I had

then I got the most recent ones, starting about 4 years ago:
Jamis Coda Comp for commuting
JC Higgins 1950s 3-speed for going to the local grocery store
Dahon Matrix folding winter bike with studded tires for ice
Luna Eclipse for wonderful long rides

who knows what lies in the world of recumbents, cyclocross, and singlespeeds!