Apple MacBook Pro - January 2008
OS X 10.5.x partitioned with Windows Vista Home Edition 32 bit
Intel Core 2 Duo T7700 @ 2.4 Ghz
2 x 1GB DDR2 SDRAM @ 667Mhz PC2 5300 Dual Channel
nVidia GeForce 8600M GT 256MB
Realtek HD Audio
15.4" Widescreen Monitor 1440 x 900 x 32bit

Dell XPS 410 - December 2006
Windows Vista Home Edition 32bit
Intel Core 2 Duo E6700 @ 2.66 Ghz
2 x 1GB DDR2 SDRAM @ 667Mhz PC2 5300 Dual Channel
2 x 1GB DDR2 SDRAM @ 800Mhz PC2 5400 Dual Channel
nVidia GeForce 8800GTS 640MB SuperClocked
Ageia PhysX Accelerator 256MB
Sound Blaster Audigy Advance HD
20" Widescreen Monitor 1680 x 1050 x 32bit

Dell Inspiron 600m - September 2005
Windows Media Center 2005
Intel Pentium M 2.0Ghz w/ Centrino Technology
2 x 512MB DDR SDRAM @ 333Mhz
ATI Radion 9000 Mobility 64MB
On Board Sound
14.1" LCD 1024 x 768 x 32bit

And my most beloved Toshiba :)