While browsing the web, I encountered a few of interesting articles:

• Michael Quack has written a guide about creating a studio lighting by yourself - The DIY guide to cheap studio lighting
• And explantion of why Canon guys have problems with consistent flash exposure - Flash Negative Evaluative Exposure Compensation
• If you are interested in nuts and bolts of the photo gear and would like to do some stuff yourself then visit CameraHacker.com

By the way don't forget to browse the second and third websites, you may find a lot of interesting information about Canon gear (camera bodies, flashes, etc.) and other tips.