Gaming Rig
Athlon XP3200+ (@stock) with Akasa Cooler on ASUS A7N8X Mobo powered by Enermax 600W Noisetaker SLi EG701AX-VE(W)-SFMA
2˝Gb PC3200 DDR RAM (1x1Gb Corsair XMS, 1x1Gb Kingston, 1x512Mb Matrix)
600Gb Disk Space (3x200Gb Maxtor ATA133), 52x52x32 CDRW
nVidia GeForce 7600GT 512MB (8xAGP), 20.1" Iiyama PLE2001WSV-B1 TFT VDU
On-Board Audio, 350W Creative Labs 2.1 Speakers
XP Pro SP1, DX9c

PCMARK2002: CPU=6768 MEM=6219 HDD=1299
3DMARK2001: 15912 @ 1024x768 (163.71 Driver)

This computer started as a project to replace former 'Main Machine' (now 'Admin Machine'). The objective here was to see how cheaply I could effectively double the spec' of the 'Admin Machine'; the only things I bought brand new were the PSU and the GPU (I still can't BELIEVE how much people were paying on eBay for a 5900 Ultra!).

Results: CPU=+66%, MEM=+189.5%, HDD=+95.6%, GPU=+77.8%
Average: +107.2%

Calling that a success!

Admin Machine
Athlon XP1600+ (@stock) with SK6 Cooler on Abit KT7A Mobo powered by Enermax EG365P-VE
1˝Gb PC133 SDRAM (512Mb Crucial, 2x512Mb Kingston),
280Gb Disk Space (2x120Gb+40Gb Maxtor ATA133), ASUS 52xCDROM, 1.44Mb FDD
Leadtek GeForce 4 Ti4600 128Mb DDR, 20.1" Iiyama PLE2001WSV-B1 TFT VDU
SB Live! 5.1, Speakers off VDU
Haupauge WinTV, DLink PFE530TX+ NIC, Alcatel Speed Touch PCI Modem (600ADSL),
XP Pro SP1, Office 2003, DX9b

PCMARK2002: CPU=4077 MEM=2148 HDD=664
3DMARK2001: 8951 @ 1024x768 (52.16 Driver)

Former main machine, now used for admin/surfing (KVM'd to the gaming rig).

Comms Machine
Sempron 2300 (@stock) with Stock HSF on Asrock K7S41 Mobo powered by Enermax EG285SX-VB(G)
1Gb (2x512Mb) Matrix PC2700 DDR
230Gb HDD Space (200Gb & 30Gb Maxtor IDE HDDs)
Sony 32x10x4 CDRW, 1.44Mb FDD
On-Board GPU, Cornerstone 21/81 fp VDU
On-Board AC97 Audio, 30W Speakers
On-Board 100Mbit NIC,
Kodak EZ200 USB Webcam
XP Pro SP1, Office 2003, DX8.1

This machine just runs Folding@Home and Trillian