haven't done it yet, will do a lot of it this year. Supposed to be great when fish are pressured or lethargic from the heat.
Here is a link to an article:
http://www.insideline.net/2001/battisti-0102-01.html
Here is a link to a video:
http://www.youtube.com/watch?v=6RFpdwWKa80
I guess the key is to use a 4-5" worm and err on the side of smaller rather than larger when in doubt. It's a finesse technique, so go slow and light. Good luck.