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There was a discussion about this on the TrueCrypt forum a while back, unfortunately it requires an account to view. If you do have an account (or want to establish one), here is the relevant link: http://forums.truecrypt.org/login.php?redirect=viewtopic.php&p=67359#673...
One suggestion was to remove MacFuse and the TrueCrypt app:
sudo rm -rf /Applications/TrueCrypt.app
Another suggestion was to use UninstallPKG. http://www.corecode.at/uninstallpkg/index.html