|Here's some fun stuff to fiddle around:
Goal Predictor: The most abstract program I found. You guess how strong and stable the teams are and the system does the rest of the work.
World Cup Chart: A bit heavy (it's a Java Applet), this is the most fun to play with. Try to guess the final results of all the matches and see how lucky your favourite team needs to be to win the Cup.
Fifa Official Something: Your guess is as good as mine. This is supposed to be Fifa's official predictor, but it's stuck.