Wonder no more!
My friend and “cow-orker”** Matt “Mongo” Hester has created a very detailed, beautifully done screencast all about how it works and what it does for you.
He’s also in the process of submitting an article to a magazine about this. I’ll let you know when it’s available.
Do you use a desktop search engine? Are you going to install it after you view his video?
**Extra points if you can comment here on where the “cow-orker” reference comes from.