Machine 1: File server
Supermicro P4SC8
P4 2.6 Ghz
1GB PC3200 RAM
4x Maxtor 200GB 7200RPM 8MB cache RAID 5 on 3Ware 7506
CDRW
Gentoo linux

Closeup of the old top and bottom

gameboxClick for larger picture
Machine 2:
Former File server
Sorme MAX602 Case
Gigabyte GA-7DX
AMD Athlon XP 2200
512MB PC2700
16MB Voodoo 3
Intel Pro100/S NIC
Netgear GA621 Gbit Fiber
Adaptec 1200A IDE RAID Controller
20GB boot drive
80GB Movie drive
Mirrored 160GB Maxtor data drives
32x NEC CDRW
Custom water cooling setup
OS: Slackware current
Machine 3: 
The Mac mini is by far the coolest little complete computer
This one runs at 1.25Ghz
512MB PC3200
40GB Laptop Drive
CDRW/DVD Drive
Mac OS 10.3 and is presently loaned out to a couple beautiful ladies.
Mac mini
Machine 4:Work in progress; me is thinking touchscreen music control for the garage.
Custom built case
Via Epia M10000 1Ghz C3
512MB PC2700
??GB laptop HD
Slim CDRW
OS: Sure won't be Microsoft!!
NOT IN SERVICE YET
Trying to find the perfect linux distro.
Scratch that, I'm just too lazy to get around to it!

miniboxClick for larger picture
Machine 5: Dell 700M Laptop
12" inch screen
1GB RAM
40GB HD
CDRW/DVD
OS: Ubuntu Linux
(yeah, I know. M$ sticker but it's gone now)

lappie486
My main machine:
Antec SuperLanBoy Case
Fortron 500W Power supply
Intel D975XBX
2.13Ghz Core2 Duo
2GB DDR2-800
250GB SATA Drive
DVD-RW
GeForce 7900GT
Arch Linux
zaurus