Computer cases represent one of the biggest challenges when deciding on a new build especially if you like to frequent LAN parties. The NZXT Panzerbox (reviewed by OCC here) is a lightweight, all-aluminum chassis that might be what you're looking for. Netbooks seem to be the perfect answer for small, easily portable computing, but if you need something a little more powerful a slim notebook like the MSI X-Slim X340 ultraportable is worth checking out.
Cases
NZXT Panzerbox ATX Gaming Case @ ThinkComputers
Cooling
Thermaltake ISGC-300 CPU Cooler @ ThinkComputers
Gaming
GOG.com - Breathing New Life into Old Games @ Techgage
Motherboards
ASUS Crosshair III Formula Motherboard @ Motherboards.org
Notebooks
MSI's X-Slim X340 ultraportable notebook @ Tech Report
Speakers/Headphones
Altec Lansing VS2421 Compact Speaker System @ RBMods
Storage/Hard Drives
Kingston 4GB DataTraveler 101 USB Flash Drive @ Legit Reviews
Solidata K5-64 SLC Indilinx Solid State Drive @ TweakTown
Video
ASUS EN9600GT 512 meg @ Bjorn3D