I've got a bunch of boxes (I'm a hardware geek and I never throw anything out) but the 3 currently in service are below:
Rig 1: Reynaldo (HTPC)
Case: Shuttle SG33G5M Deluxe
Processor: Intel Core 2 Duo E4500 @ 3.2GHz (3201MHz)
Motherboard: Part of Shuttle Barebones, Mini-ITX
Power Supply: Shuttle Mini-ITX (part of barebones)
Memory: 2x2GB Crucial Ballistix DDR2-800 (1:1 @ 582MHz)
Hard Drive: 750GB Seagate 7200.10 SATA
Video Card: Onboard Intel GMA X3100
Monitor: Westinghouse 46" 1080p LCD HDTV
Sound Card: SPDIF -> Onkyo 7.1 Receiver
Keyboard: Logitech DiNovo Edge
Mouse: Built into keyboard
Optical Drive: LG Blu-Ray/HD-DVD Combo Burner (Burns BD-R at 2x)
Operating System: Windows 7 Ultimate 32-bit
Rig 2: Fortinbras (Desktop/Storage)
Case: Cooler Master Stacker 830
Processor: Intel Core 2 Quad Q6600 @ 3.4GHz (3375MHz)
Motherboard: Asus P5K Deluxe/Wifi-AP
Power Supply: Enermax Revolution85+ 1050W
Memory: 4x4GB G-Skill DDR2-800 (running at 1:1 or 750MHz)
Hard Drive: 19TB total in RAID5 in 5 arrays, mixture of 1TB and 750GB drives
Video Card: 8800GTX w/ Thermalright HR-03 Plus OCed to match 8800 Ultra speeds
Monitor: 2x 24" Acer (X241W)
Sound Card: Onboard SPDIF to Zero Stereo DAC -> Presonus HP4 headphone amplifier
Speakers/Headphones: Multiple, primarily HD280 Pros and Alessandro MS Ones
Keyboard: Razer Tarantula
Mouse: Logitech MX518
Mouse Surface: X-Trac Ripper XL
Operating System: Windows 7 Enterprise 64-bit
Rig 3: Rosencrantz (Gaming, new)
Case: Cooler Master HAF 922
Processor: Intel Core i5-750 @ 4.0GHz (4000MHz)
Motherboard: EVGA P55 SLI FTW E657
Power Supply: OCZ ModxStream Pro 600W
Memory: 4x2GB G-Skill Ripjaw DDR3-1600 (1:1 at 1600MHz)
Hard Drive: 2x Intel X25-M G2 80GB SSD in RAID0
Video Card: 2xMSI Radeon 5770 Hawk in CrossfireX + 1x MSI GT240 GDDR5 OC for PhysX
Monitor: 1x 25.5" Asus + 1x Samsung T260HD 26"
Sound Card: Onboard SPDIF to Zero Stereo DAC -> Custom Built Headphone Amp
Speakers/Headphones: Alessandro MS Pros
Keyboard: Razer Tarantula (Shared with Rig 2 over a USB KVM)
Mouse: Logitech MX518 (Shared with Rig 2 over a USB KVM)
Mouse Surface: X-Trac Ripper XL
Operating System: Windows 7 Enterprise 64-bit
I just finished Rig 3 on Friday (at around 3AM), it's fabulous thus far.