The May issue of Equipper features resources on preaching. That issue and all past issues of Equipper are available for download at http://mindev.gci.org/equipper.htm
We also learned that there is a free webinar (on-line conference) on preaching coming up on May 16 from 4:00 to 8:00pm (EDT). It is produced by The Rocket Company. You will find the details as http://therocketcompany.com/preachbettersermons/.