http://www.micromarching.com
At this site, you can create your own sets for a little virtual marching band! You only get basic moves/colors unless you sign up for premium, which costs $39.95 per month, and would only be useful if you're actually a band director. But, you can still make pretty awesome shows, and publish them for other people to view/judge.
You can also view/judge shows made by other members of the site, and I guess it earns you some sort of experience points, but I haven't figured out what they're for.
Not much else to say about it other than it's the coolest thing I've seen in quite some time.
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