I've been using XBMC since the days of the XBOX and I have been a big fan ever since. Here it is:
unRAID server
Case - NZXT Source 210 USB 3.0 Mid Tower Chassis
Motherboard - ASRock H77M Motherboard
CPU - Intel Celeron Dual-Core G540 2.5 GHz Processor
Memory - Kingston HyperX Blu 4GB 240-Pin DDR3 SDRAM
Power Supply - Corsair Builder Series CX 430
UPS - APC Back UPS ES8
Running unRAID 5.0rc11 with (CouchPotato, Sick Beard, SABnzbd, MySQL, Crashplan, AirVideo)
Total Storage = 8TB
HTPC
Motherboard - ASRock A75M-ITX
CPU - AMD Triple-Core A6-Series APU
Memory - Kingston HyperX Blu 4GB 240-Pin DDR3 SDRAM
SSD - Patriot Torqx 2 PT264GS25SSDR 2.5" 64GB SATA II Internal Solid State Drive
TV Tuner - TBS6920 DVB-S2 TV Tuner PCIe Card
Case - In Win BM639 Black Mini-ITX Case
Running Windows 7, XBMC, Steam, WMC (for Live TV)
Other Stuff
Other Notable Parts
LG 42LH3000
Samsung HT-E5530 5.1 System
Sonos Play:3
Logitech Harmony 520
Logitech Rumblepad 2 (2 of them)
Nintendo Wii
iPad Mini (Jailbroken with XBMC)
unRAID server
Case - NZXT Source 210 USB 3.0 Mid Tower Chassis
Motherboard - ASRock H77M Motherboard
CPU - Intel Celeron Dual-Core G540 2.5 GHz Processor
Memory - Kingston HyperX Blu 4GB 240-Pin DDR3 SDRAM
Power Supply - Corsair Builder Series CX 430
UPS - APC Back UPS ES8
Running unRAID 5.0rc11 with (CouchPotato, Sick Beard, SABnzbd, MySQL, Crashplan, AirVideo)
Total Storage = 8TB
HTPC
Motherboard - ASRock A75M-ITX
CPU - AMD Triple-Core A6-Series APU
Memory - Kingston HyperX Blu 4GB 240-Pin DDR3 SDRAM
SSD - Patriot Torqx 2 PT264GS25SSDR 2.5" 64GB SATA II Internal Solid State Drive
TV Tuner - TBS6920 DVB-S2 TV Tuner PCIe Card
Case - In Win BM639 Black Mini-ITX Case
Running Windows 7, XBMC, Steam, WMC (for Live TV)
Other Stuff
Other Notable Parts
LG 42LH3000
Samsung HT-E5530 5.1 System
Sonos Play:3
Logitech Harmony 520
Logitech Rumblepad 2 (2 of them)
Nintendo Wii
iPad Mini (Jailbroken with XBMC)