Main computer:
AMD Phenom II X4 940 @ 3.5GHz
2x 2GB DDR2 1066MHz OCZ Gold
ASUS Nvidia Geforce 460 GTX @ 900/1800/1960
OCZ ModXStream Pro 700W Silent Modular PSU
ASUS M3N78-VM Motherboard
2x 512GB 7200rpm HDDs in RAID0
1x 1TB 7200rpm HDD
All in a Cooler Master HAF 932 case (which is ****ing enormous)
EDIT found an old pic to show size, on the right is my computer, on the left a typical system from a computer store
EDIT2: Forgot OS: Windows 7 Ultimate & Ubuntu dual boot, also have several other OS in VMs
Spare computer (built using old parts from upgrading):
AMD Athlon 6000+ @3GHz
2x 1GB DDR2 800MHz
XFX Nividia Geforce 9600GT
200GB HDD
Generic 500W PSU
Windows 7 Home Premium
All in some cheap generic case, that doesn't look too bad, but is made of wafer thin metal (and has the front held on with selotape)
Also have an old IBM server which has a pentium 4 in it and has three SCSI drive with a hardware RAID controller. cannot remember spec off the top of my head though.
Portable computers (to lazy to put specs, just google them):
Zoostorm Freedom 10 Netbook, Win7
ASUS eee 701 4G + 16GB SDHC card + 2GB RAM, Backtrack 4 R2 + eeebuntu
esystem 1201 laptop, WinXP
Sony Vaio VGN-N38E laptop, WinVista
ipad 1 (if that counts)