At home I'm running a MacBook Pro with Leopard and two G4 'Sawtooth' PowerMacs (both running Tiger). At work we have an assortment of G4 and G5 PowerMacs and iMacs of which I use a dual 2Ghz G5 PowerMac.

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MacBook Pro 15" | Mac OS X 10.6 • 2 GHz Intel Core Duo • 2 GB DDR2-667 • ATI Radeon Mobility X1600 128 MB • 100 GB Serial-ATA
Hackintosh | Mac OS X 10.5.6 • 3 GHz AMD Athlon 64 X2 6000+ • MSI K9N AM2 • 2 GB DDR2-667 • NVIDIA GeForce 8800 GT 512 MB • ALC888 Audio • 300 GB Serial-ATA
iPhone 3G • 8 GB