Post your computer specs here!

-Desktop-
Case: Silverstone SG03
Mobo: ASUS Maximus IV GENE-Z
CPU: Intel i7 2600K
RAM: 2x4GB G.Skill Sniper DDR3 1600
PSU: Antec BP-550
GPU: XFX HD 6870
HDD: 1.5TB WD Caviar Green (I think)
Disc drive: ASUS external DVD-RW

Monitor: 1x Samsung 21.5"
Keyboard: Das Keyboard Professional S
Mouse: Logitech G700
Surface: Steelseries Qck
Headphones: Sennheiser HD 595
Speakers: M-Audio AV40
Webcam/mic: Microsoft LifeCam HD 5000
Additional mic (older for headphones): Zalman clip on

Crazy nice mATX case that can fit in my suitcase

-Laptop-
Lenovo Thinkpad X220

CPU: Intel i5 2520M 2.5GHz
RAM: 8GB
HDD: 160GB Intel SSD

Updated with new screen + second 6770 + SSD

Computer: Custom
Laptop/desktop: Desktop
Processor: AMD Phenom II X6 1090t Black Edition 3.2Ghz (stock clock specification) (OC'ed to 3.6GHz for daily use)
Hard drive(s): 7200RPM SATA III 1TB HDD, 120GB Agility 3 SSD, 320GB HDD for extra storage
RAM: 16GB DDR3 @ 1333mhz
Graphics card(s): AMD Radeon HD 6770 w/1GB GDDR5 vRAM x 2
Screen(s) size/resolution: 1920x1080 LED backlit LCD x 2
DVD/CD/other drive(s): None
Operating system: Windows 7 Professional x64
Ports: Check specs on the motherboard listed below.
Other info/features: ASRock 970 EXTREME4 AM3+, XIGMATEK Gaia SD1283 CPU Heatsink + 2x 120mm 70CFM fans in Push/Pull config, ASUS PCE-N13 b/g/n Wireless Adapter, Xigmatek ASGARD II case, XFX branded HD 6770, NZXT Fan Controller to quiet things down.
Age: Built July 29, 2011

Also, I've built a CustoMac Mini:

Computer: Custom CustoMac Mini 2011
Laptop/desktop: Desktop
Processor: Intel Core i3 2105 @ 3.1Ghz
Hard drive(s): 1 x 500GB 7200RPM
RAM: 8GB DDR3 @ 1333mhz
Graphics card(s): Intel HD 3000 (integrated on processor)
Screen(s) size/resolution: 1920x1080 LED backlit LCD x 2
DVD/CD/other drive(s): None
Operating system: OS X Lion
Ports: Check specs on the motherboard listed below.
Other info/features: Low-noise Scythe Slipstream Case fan (poor ventilation in the case ), Rosewill b/g/n wireless adapter, Gigabyte GA-H61N-USB3 motherboard, APEX MI-100 Mini-ITX case.
Age: Built January 3rd, 2012
Currently dual-booting with Windows 7, though 99% of the time I'm on the Mac. If I want Windows, I'll use my better desktop.

Processor: Core2 Duo E6550 clocked at 2.33ghz
Motherboard: ASUS P5G41T-M LX Plus
Video Card: MSI Radeon HD5770
RAM: Kingston Value 4GB 1066 DDR3 SDRAM
PSU: Antec VP-450
Hard Drive: Seagate Barricuda 1TB 7200 RPM
Chassis: Rosewill Challenger

Need new RAM... thinking about upgrading to a Core i5 too.

My newlybuilt PC!
Computer: Custom
Laptop/desktop: Desktop
Processor: Intel Core i5 3570k 4.1 GHz (Overclocked!)
SSD: Samsung 850 Pro 256GB (This thing is way too fast)
Hard Drive: Seagate Barracuda 3TB 7200 RPM SATA3
RAM: Corsair Vengeance LP 16GB 1600MHz DDR3
Graphics Card: MSI AMD Radeon R9 290X 4GB 1050MHz
Screen: 23" ASUS 1080p
Optical Drive: Some Sony DVD Burner with engraved logos so it's still black
Operating System: Windows 10 Professional x64
Ports: 6x USB 3.0, 2x USB 2.0, 1x HDMI, 3x DVI (one for the onboard graphics and two on the GPU), rest aren't really important.
Other info/features: 850W PSU, Asrock Z77 Extreme 4 Motherboard, Hyper 212 EVO cooler, Corsair Vengeance C70
Age (As of this edit): 2 Weeks! 3 years now! Still maxes things out :3

What program did you use to manually OC your 7970. I'm looking at getting the 7970 after the 8000 series comes out (hoping it drops in price a little bit).

Computer: GA-970A-UD3 in an In-Win Dragon Rider Case
Laptop/desktop: Desktop
Processor: AMD FX-8150 8-Cores @ 3.6GHz
Hard drive(s): 250 GB OS SSD, 64 GB Cache SSD 3 TB HDD for games, and a 1 TB HDD for everything else
RAM: 16 GB PC3-12600
Graphics card(s): XFX, R9 290, 4 GB
Screen(s) 1 1920x1200 monitor and 1 1680x1050
DVD/CD/other drive(s): Blu-Ray/DVD combo drive
Operating system: Windows 10 Pro 64
Ports: 4xUSB 3.0, 11xUSB 2.0, 1x Firewire, 1 Optical Audio, and 5.1 surroud sound
Other info/features: Wireless N+ Card and Memory Card Reader
Age: I built the computer 3 years ago

Computer: MSI P35 Neo2 FR in a Nvidia Case from ~07
Laptop/desktop: Desktop
Processor: Core 2 Quad Q9650 @ 3GHz
Hard drive(s): 2x 1 TB backup drives and 2x 1 TB OS drives
RAM: 8 GB PC2-6400
Graphics card(s): MSI Gefore 250 512 MB
Screen(s) size/resolution: 1920x1080 monitor
DVD/CD/other drive(s): DVD Drive
Operating system: Windows 10 Home and OSX 10.10.4
Ports: 7xUSB 2.0 , 1xFirewire, 2 eSata, 1x Optical, and 5.1 Surround sound
Other info/features: Wireless N
Age: Built from spare parts where I work in 2014

Computer: Macbook Pro 2012
Laptop/desktop: Laptop
Processor: i5 dual core @ 2.5 GHz
Hard drive(s): 2 TB Drive
RAM: 16 GB PC3-12600
Graphics card(s): Intel HD 4000
Screen(s) 13 inch display
DVD/CD/other drive(s): DVD Supermulti drive
Operating system: OSX 10.10.4 Windows 10 Pro 64
Ports: Firewire, Eathernet, 2x USB 3.0, Thunderbolt, and audio
Other info/features: none
Age: Bought for work in 2014