I've collected one of the best games on the internet about FRIENDS.
Here are the websites I got it from:

Matchmaker (shockwave)
Video Trivia (windows media player)
Drinking Game
The Apartment (Quicktime)
Central Perk (Quicktime)
The Alley (Quicktime)
Ross and Monica morph
Guess who?
Who Said What?
Trivia 2
Friends OR
Interactive Love Story with Chan & Mon
Altered Photo Game