Get someone to bring over a PS2. Rent Eyetoy and Singstar. Easily the most fun a group of friends can have. There's nothing worse than having a party and having girls and guys divided because all the guys are crowded around a PS2 looking playing GTA. With games like Eyetoy and Singstar, that doesn't happen.

If this party is going to have alcohol or just a lot of drinks, get everyone to bring a bag of ice fill up the bathtub. It's a lot easier to access drinks that way. Saves people the trouble of having to look through your fridge.

If you know that there are couples coming...LOCK YOUR ROOM! There's nothing worse than finding out your mate and his girlfriend were in your room for 5 hours (speaking from experience :O)