fairly recent build for me as well- < 4 months or so.
CPU: Intel Core 2 Quad Q8200 @ 2.33Ghz
Motherboard: Gigabyte EP43-UD3L
RAM: 8GB DDR2 Corsair PC2-6400
HDD: 750GB Seagate 7200RPM (forget the exact model#)
Optical Drive: LG +-R/RW +Lightscribe
Case: Cooler Master 500
Monitor: Acer E151H (1440x900)
Graphics: NVidia Geforce 9800GT 512MB GDDR3
PSU: Corsair TX750W
Network: On-board PCI-E Gigabit, as well as my Xtreme-N Wireless Card that I installed for no good reason.
Sound: RealTek HD- but I'm using my X-Fi XtremeGamer I installed in it instead
OS: Windows Vista Ultimate x64
PC before that was a Dell Dimension 4400; used it for around a year and a half.
CPU: Intel Pentium 4 1.6Ghz
Motherboard: Intel Pendleton 854PT
RAM: 1GB DDR (I believe it was either transcend or Corsair)
HDD: 500GB WD Caviar 7200 RPM
Optical Drive: Samsung WriteMaster DVD+-RW
Case: Stock
Monitor: Same as above
Graphics: NVidia Geforce 5500FX
PSU: stock- I think it's only 250W
Network: D-Link DGE-530TX Gigabit PCI
Sound: Same X-Fi card I'm now using in this build.
OS: Windows XP Pro SP3
And Before THAT: (Might I add that this is all from memory except my latest build?)
CPU: AMD K6-2 350Mhz (now a 500Mhz)
Motherboard: ePoX MVP3-G
RAM: 512MB PC133
HDD: 80GB WD Caviar (cylinder reduction jumper set, only 32.7GB usable)
Optical Drive: Samsung WriteMaster DVD+-RW
Case: some crappy ol' standard white case.
Monitor: whatever I could use! I was lucky if I got a monitor capable of more then 800x600 sometimes.
Graphics: Came with a ATI Rage Pro 8MB, upgraded to a Radeon 7000VE which failed, used a PCI Radeon 9250 for a while, up until I got the Dimension.
PSU: awful stock PSU until recently, when I replaced it with a much quieter Antec.
Network: D-Link 100mbps
Sound: Creative SB Audigy SE
OS: Windows XP SP2
Need I go on? I can remember all the way back to my 286 if I wanted to...