From Todd's Apps:
If you have used the Junk mail filter in Mail.app on the mac, you know that even with the best training, you can still be left with hundreds of unwanted emails. What's worse? Spam-filtering programs often make it possible to do *so* much that the average user becomes overwhelmed with the process of setting up special boolean rules and filters. JunkIt is a free alternative for the average mac-user who wants an easy-to-use method for preventing unwanted emails from piling up in their inbox.