Here is a cute quiz which is much like a FaceBook quiz where you determine which movie star you are like; except this is to assist geeks to know which RPG they are.
Nuts, but cool: http://strategerygames.com/whichrpg/
What I like is that you could use this tool to see which game you’d like to play next. Get the players to all do the quiz (it takes 2 minutes maximum), and then see what the thought is. It can also be used to find similar game to the ones you like now, and are perhaps complementary or have subtle differences.
The material its is based upon is from the RPG flowchart by Inkwell Ideas.