This is a cut and paste from the lighting technique forum over on DP Review by Chuck Gardner. I find his writing style to be easy to read and his technique excellent. Bookmark this
thread and give it a read.
Here are a collection of tutorial threads I've posted here in the past which you may find helpful:
Basics for Beginners:
http://forums.dpreview.com/forums/re...ssage=11810851
Lighting 101:
http://forums.dpreview.com/forums/re...essage=7351593
Lighting 102:
http://forums.dpreview.com/forums/re...essage=7490406
Using "Inside-Out" Cropping to isolate your center of interest:
http://forums.dpreview.com/forums/re...ssage=12312255
Human Perception Exercise
http://forums.dpreview.com/forums/re...essage=9544546
Criteria for selecting backgrounds:
http://forums.dpreview.com/forums/re...ssage=12307659
Lighting ratios and flash metering techniques:
http://forums.dpreview.com/forums/re...essage=8206126
Comparison of Beauty Dish with Softbox:
http://forums.dpreview.com/forums/re...ssage=10139440
Using dual camera style (hotshoe) flashes for candids:
http://forums.dpreview.com/forums/re...ssage=12307416
Also read this one by Joe Zeltsman. The equipment advice and examples are a dated, by his simple to understand explainations of the human form and how to best reveal it with pose and light are among the best I've read.
http://jzportraits.home.att.net/chapter-01.html