http://www.strobist.blogspot.com/

Strobist is dedicated to off camera flash.  They have some amazing lighting tutorials on here and even tutorials on how to DIY some lighting equipment like a gridspot, snoots, GoBos and other stuff.  It's a great site if you're interested in learning how to do some studio lighting or just learning how to use light (that's a biggie...)  They have a 'course' called lighting 101 (free of course) that's very informative!

(they also have a flickr group where you can submit your pictures, but they have to be done with off camera flash)

contents below Copied from site

Lighting 101 Series

(If you start with the first one, they are linked in order to each successive lesson.)

Two Things Your Flash Needs to Have
Traveling Light
Light Stands
Super Clamps
Ball Bungees
Umbrella Stand Adapters
Synching: PC Cords and Pocket Wizards
Building a Pro PC Cord, Pt. 1
Building a Pro PC Cord, Pt. 2
Soft Light: Umbrellas
Soft Light - Wall/Ceiling Bouncing
Bare-Tube Style Lighting
Hard Light - It's Better Than You Think
Balancing Flash Intensity With Ambient, Pt 1
Balancing Flash Intensity With Ambient, Pt 2
Using Gels to Balance Light Color
Cereal Box Snoots and GoBo's
Textural Lighting for Detail Shots
Cross Lighting
Back Light as Main Light
Headshot in a Corner
Lighting for Glasses
Long-Throw Hard Light
Reverse Engineering Other Shooters' Light
Know The Flash
See The Flash
Be The Flash
Don't Let Good Light Ruin a Photo
Keep a Lighting File

Thanks for the link!  I've been wanting to play with off camera lighting, but it can be overwhelming with all those equipments and terminologies.