The final call for code submissions has just gone out on the DFW Perl Mongers mailing list. The deadline is Monday night at 9pm CST. See dfw.pm.org for details.
If you want to compete but feel like you're late to the game or don't know where to start, fork the reference code on github https://github.com/tommybutler/dupfind
If you want to get on the pre-contest leaderboard (just set up on the website), then please send your performance metrics to dfwpm at internetalis dotnet.
Special thanks goes out to The Perl Shop for sponsoring the contest!