A series of tutorials and articles on various tips and techniques (such as bounce photography, syncing and remote firing) to help you make the best of your Speedlites.
Speedlite Camera Flash Basics - Canon Europe
Camera Flash Types Types of DSLR Photography Flashes Explained
On-camera flash outdoors - Tangents
In Focus: The Basics of External Flash Photography
In Focus: The Basics of External Flash Photography
How to Capture Portraits with Indoor Flash Photography
Flash Modes Explained
The ultimate guide to flash photography - Amateur Photographer
5 Simple Bounce Flash Photography Tips
In Focus: The Basics of External Flash Photography
Box Focus photography studio blog
High Speed Sync: A Flash Technique
On-camera flash outdoors - Tangents
How to Capture Portraits with Indoor Flash Photography