Sally Morgenthaler
author of Worship Evangelism
a great, simple article on rehearsal structure and planning your practices, etc.
originally posted at ccli.com/WorshipResources/Articles.cfm?itemID=22
found it posted here although layout is sloppy: click here
From Worship Matters
Bob Kauflin
http://www.worshipmatters.com/2006/01/25/what-does-a-worship-leader-do/