1.) Your wardrobe is instantly doubled. Obviously, this number one great benefit of having a great roomate is the inspiration for this movie poster.
2.) Your CD/DVD collection is instantly doubled.
3.) Someone will always drive you to your car the morning after.
4.) You can share a bottle of wine instead of trying to drink it all yourself before it gets yucky.
5.) Someone will listen to your work/boyfriend/commute/weight/etc. gripes
Try this flicker tool. It's so fun!