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The Internet is the best place to keep up to date on the world of flash photography. Here are some useful sites worth investigating.
Run by your author, this site has a series of useful articles on photography, an online dictionary of terms and jargon, and a complete compatibility lookup table for Canon EOS gear. photonotes.org
The site that revolutionized enthusiast use of off-camera flash. Founded by former photojournalist David Hobby, this site has introductory articles, a lively discussion area, and a huge community of avid Strobists. strobist.com