
I personaly like to throw halo2 partys and hook up multiple systems.
To do this,the supplies you need are 2 Xboxes(obviously), a Net Gear (or other network device, or a crossover cable) and 2 Cat5 cables to hook up the xboxs to the Net Gear.
When playing Halo2 on two systems its best to have the tvs in different rooms so you and your freinds can't see each others screen (which starts alot of fights when playing.)