Core 2 Quad
8GB DDR2 PC2-6400
XFI 780i motherboard
XFI geforce 8800 GTS (g92) 512mb
2xWestern digital raptor 160gb (raid 0)
SATA based dvd burner
Thermaltake armor case
22" and 19" monitors
windows vista ultamate x64

Laptop
Gateway P6860FX
Intel Centrino Core 2 Duo T5550 @ 1.83 GHz
4 Gigs Ram
nVidia GeForce 8800M GTS
300 Gig Hard Drive
Vista Home Premium 64 bit ( no troubles, except trying to dual boot anything )
Desktop
Intel Core 2 Duo T6420 @ 2.13 GHz
4 Gigs Ram (only 3.93 visible, 32 bit OS)
nVidia GeForce 7900 GS
300 Gig Hard Drive
XP Home (upgrading with new video card to 64 bit Vista soon...ish)
Overkill for this site's games

Yeah, what do you need such processor and graphics card with this amount of RAM? And man, I am impressed you can even get on GoG.com with such a PC.

I have both a desktop and laptop.
Desktop:
MB: ASUS
CPU: 2.4ghz Intel Core 2 Duo
Memory: 4 Gigs
Hard Drive: 500 GB (partitioned into a 40GB section for OS install and 440 GB section for everything else)
Monitor: 23" Widescreen Samsung 720p HDTV (Would like to get a 20" 1080i computer monitor in the future so the TV can be a TV)
GPU: Geforce 8400GT
DVD RW
Saitek Eclipse Keyboard
Razer Diamondback mouse
Windows Vista Home Premium 32bit
Laptop
Macbook with 80GB HDD and 1.86 Ghz Core 2 Duo running OSX 10.4

Motherboard: P35-DS3R - F12 Bios
PSU: Corsair HX620
CPU: Intel Core2Quad Q6600 @ 3.24ghz (8*405 - 1620fsb)
RAM: 4GB PC6400 (4-4-4-12) @ 810mhz
GPU: ATI Sapphire HD2900 512mb Pro @ 800mhz Core & 2000mhz Memory
Monitor: Dell Ultrasharp 2007WFP (20" 1680x1050 S-IPS LCD)
Sound Card: X-Fi Fatality Xtreme Gamer Pro
Speakers: Logitech X-230 (2.1)
Optical Drive: Samsung SATA2 DVD-RAM+RW
HD0: Maxtor 160GB SATA2 16MB Cache
HD1: Samsung 500GB SATA2 16MB Cache
HD2: Samsung 750GB SATA2 32MB Cache
OS: Microsoft Windows XP Home

Lenovo ThinkPad SL400:
Intel GMA4500HD
Core2Duo T7100
2Gb RAM
Vista Business

Alienware m9750
Windows Vista Ultimate 32-bit SP1
Intel Core 2 Duo T7600 @ 2.33ghz
2x Geforce 8700M GT (SLI)
4 GB DDR2 RAM
2x 200GB HDD

Mob: Msi K8T-Neo FSR
CPU: AMD3000+
RAM: 2GB DDR
GPU: GeForce 6800GT
Monitor: 24 inch 1920x1200
Keyboard and mouse: apple keyboard, logitech wireless mx1000

I have about a half dozen different machines in different states of usage and repair, but my main machine is this low to mid-end pile that I built from spare parts:
Mobo: Intel D865PERC
Processor: P4 3.0GHz HT
Ram: 2 GB
Video: MSI GeForce 7600GS 256MB
Monitor: Samsung SyncMaster 753DF
Sound: SB Audigy LS
Speakers: Logitech Z-640 5.1
HDD: 2X 120GB
Optical: Samsung Lightscribe DVD-RW DL
OS: Windows XP SP3
Keyboard: Logitech Media Keyboard
Mouse: Logitech MX 510

Model: Dell XPS 710
Processor: Intel Core 2 Duo e6600 @ 2.40ghz
Memory: 4 Gig ram
Video: Nvidia Geforce 8800 gtx 768mb
sound: SB Extreme Music
OS: XP 64bit pro

AMD Athlon X2 6400 @ 3.36GHz/Core
2GB Mushkin XP8300 DDR2
Asus M2N32SLI Deluxe MB
GeForce 9800GX2 @ 700/1200 MHz (1GB)
Mushkin XP650 PSU
Silverstone TJ07
SoundBlaster XFi Gamer

Mobo: Intel D865PERL
CPU: Intel P4 2.6
Ram: 2 GB
Video Card: SAPPHIRE Radeon X1950PRO 512MB 256-bit GDDR3 AGP
HD: Seagate Barracuda 320 gb
Display: Samsung 958P CRT
OS: Win XP Pro
I'm maxed out with this comp, its still decent, but I need to replace it in a year.

Main machine:
Gigabyte P35-DS3R
Intel C2D E8500 / Thermalright HR-01 Plus
4GB Corsair PC6400 DDR2
Samsung HD103UJ HDD
Gigabyte HD4850 / AC S1 Rev2
Creative XFi Fatal1ty Pro
Corsair HX520W
Antec P182
Windows XP SP3
Notebook:
Toshiba Satellite Pro A200
Intel C2D E7200
4GB Kingston PC5300 DDR2
Seagate 5400.5 320GB
Windows Vista 32b SP1

Self Built
AMD 3200
1.5 GIG RAM
2-250 GIG Harddrives
DVD-RW
CD-RW
Nvidia 7300 GS 128 VRAM
Windows XP Pro
WIndows Vista Ultimate
Flat Screen Monitor / TV monitor
Network to a 3 Megs connection

I use two computers commonly.. One is my old computer that I keep around for checking email and letting people do basic stuff when someone is useing my good computer (often to play WoW, of all evil task!) GOG has been great, as my old computer can be used to play games without hunting for the disk I've lost years ago.
GOG and email/browsing PC
AMD Atholon 1.2Ghz
800MB RAM
Windows NT
Radeon 9250 with 128mb VRAM
Primary computer:
Core2Duo
2GB RAM
Windows XP
Geforce 8800GT