Find out your US presidential pick
This is an interesting site where you list your views on a number of topics and then it ranks the US Presidential Candidates based on your answers so you know who agrees with you the most. Apparently I would be a Kucinich supporter.
The one flaw that I see in this approach, in that it only covers the "spectacular" issues. Mostly social and "soft" issues. There is not much mention of economic issues, which might shift the matrix one way or the other for most people.
Neat idea though.