Where's the Windows love in here, OS X is winning by miles at the moment!
My main computer:
*Acer Aspire 1714 Laptop (2.5 years old)
*Intel Pentium 4 HT 3.4 GHz
*1 GB Ram
*17" 1280x1024 screen
*nVIDIA GeForce FX Go5700 128 MB graphics
*120 GB 7,200 RPM HD (+ 0.5 TB 7,200 RPM USB2 external HD)
*Integrated DVD-RW, 2x card readers, 4x USB ports, 1x parallel, 1x serial, 1x PS/2, FireWire, modem, ethernet, WiFi
*Microsoft Windows XP Professional (soon to be dual-booting with (legit) Windows Vista Business), Office 2007 Enterprise etc
*Weight: 7.1 kg, battery life ~1h15m
My main Mac:
*Beige G3MT (8.5 years old)
*PowerPC G3 400 MHz CPU
*640 MB Ram
*8 GB, 12 GB and 20 GB HDs
*Sony DVD-RW drive
*4-port USB 1.1 card
*Apple 100baseT ethernet card
*ATI Radeon Mac Edition 32 MB graphics card
*Apple Studio Display (original dark-blue model) 15" 1024x768 LCD screen
*Mac OS 9.2.2 and Mac OS X 10.4.9 (dual-boot), iLife '05, iWork '06 etc
*Apple Extended Keyboard II and Apple ADB Mouse II
PS you forgot the "PC running Mac OS X" option

Main system: custom C2D 2.66GHz tower/4GB RAM/2600XT 512 MB/500GB HD/XP Pro x86+Vista Business x64
Main Mac: Beige G3 minitower (Sonnet G4 500MHz/640 MB DVD/USB/Radeon 32 MB/OS 9.2.2+10.4.11)