With the help of various Wave APIs and a team of similarly sports-crazy developers in India, we created Google Wave Football Fever. From this site, people can create both prediction waves (important) and party planning waves (vital). Here's what our "Germany v Australia" prediction wave looked like - I didn't do so bad!
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There are still a few more Australia games left in the first round, so you've got time to try out Wave Football Fever for predicting their outcomes.
We also have a team member and local, Pat Coleman, who's live-waving various games for fun. You can check out his index of live waves here. You'll notice there's no live wave for Australia v Germany - that's because we were all at Darling Harbour, trying to watch the game along with thousands of other nightowl Australians :-)
Enjoy the World Cup!