The Anti-Phishing Game!
OK, so its no Halo 3. But this game, sponsored by Carnegie Mellon University is designed to help you identify and recognize when someone is phishing for information out of you.
Called Anti-Phishing Phil, you'll swim around a "phish tank" either eating worms that are good URL's or rejecting those worms that are phishing web sites. A fun diversion, but also a useful teaching tool, sending this out to your users will entertain them while educating them on watching their URL's closely.
http://cups.cs.cmu.edu/antiphishing_phil/
Credit for finding this web site due to Russ Mitchell's weekly MCP Magazine column at:
http://mcpmag.com/columns/article.asp?editorialsid=2329

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