Today I noticed a blog I had not heard of did a great write up on how to use this script as part of a broader strategy for building your twitter following. They do a much better job of explaining the concept than we did.
Basically, just go to Twellow and find the people in your target niche. Bring up their follower pages and turn our script loose on their followers. After a few days, use our script to drop all the non-mutual followers you have.