My "collection" is quite a bit smaller than it once was, but over the years I've had/have (in order of age, not acquisition)...
iMac G3 Rev. A
iMac G3 Rev. C
Original Blueberry iBook G3 "Clamshell"
"Snow" 12" iBook G3 800 MHz
12" iBook G4 1 GHz
12" iBook G4 1.33 GHz
12" PowerBook G4 1.5 GHz
eMac 1.42 GHz
20" iMac Core Duo
1.83 GHz Mac mini Core Duo
2.2 GHz Black MacBook Core 2 Duo
Not really "impressive" by some standards, but still a bit of a varied collection if I do say so myself.
Oh yeah, there's also exactly 20 PC's scattered about in there somewhere.
Cool, I still want a PowerBook G4 12-inch. Awesome computer.