Manufacturer: self built (Asus μATX base unit, black/silver)
Processor: AMD PhenomX4 2.6GHz, cooled by Nitrogon NT06 [http://www.silverstonetek.com/products/p_contents.php?pno=nt06-lite] heatpipe heatsink and ultra-quiet 120mm fan
Memory: OCZ Reaper 2x1024GB PC2-8500 [http://www.ocztechnology.com/products/memory/ocz_ddr2_pc2_8500_reaper_hpc_edition] 5-5-5-15 1066MHz DDR2 with heatpipes
Graphics: Gigabyte nVidia 8600GTS 256MB DDR3 SilentPipe3 [http://www.giga-byte.com/Products/VGA/Products_Overview.aspx?ProductID=2512] heatpipe passive cooling (no fan!)
Power supply: Zalman 600W [http://www.zalman.com/ENG/product/Product_Read.asp?idx=196] with ultra-quiet variable-speed 120mm fan and heatpipes
Hard disk: 250GB SATA2 7200RPM Seagate with Zalman heatpipe cooler [http://www.zalman.com/ENG/product/Product_Read.asp?idx=134]
Optical: Asus DVD+-RW Lightscribe black
Monitor: Asus 19" LCD 4:3 1280x1024 2ms black/silver
Speakers: built-in (or headphones)
Mouse: Microsoft Intellimouse USB black
Keyboard: Logitech Internet Keyboard USB black/silver
OS: Dual-boot Gentoo Linux and Windows XP
Fans: GPU is passive cooled, no fan there; ultra-quiet 120mm fans on CPU and PSU, already described; plus ultra-quiet 80mm fan at case rear. Super duper! I loves heatpipes
Built in stages. Cost less than £800 eighteen months ago. No grotesque neon lights or fancy decals. Calm and collected on the outside, with subdued and tasteful style, giving no indication of the awesome power contained within :-D
Also, laptop: Asus X50: Intel 2GHz Core2 Duo, 2GB 533MHz DDR2 RAM, nVidia GeForce 8200MG, 250GB SATA, DVD+-RW, 15.4" TFT 16:10 1280x800, weight 2.6kg (not too heavy), OS: Ubuntu Linux.
And I am no more a geek than Jeremy Clarkson when he pines over how many horsepowers his car has! ;-)