This site is created on a PowerBook G3 (Firewire) a.k.a. Pismo, with a 400MHz G3 processor and 512MB of RAM, running Mac OS 9.1 or OS X 10.1.5 depending on my whim and needs.
It was then maintained on a Powerbook G4 (Titanium), with a 1Ghz G4 processor and 1 GB of RAM, running Mac OS X 10.3.x.
Current updates are being done on Powerbook G4 (Aluminium) with 1.67GHz G4 processor and 1 GB of RAM, running Mac OS X 10.4.x
I upgraded to MacBook Pro, 2.4GHz Core2Duo, 2GB RAM, OS X 10.5.x