Here is a link to an article in the Canon Digital Learning Center that contains links to numeroius "Quick Guides", which you can download into your phone or tablet as a PDF file.
http://www.learn.usa.canon.com/resources/articles/2011/quick_guides.shtml
Half of the articles seem to cover Speedlites, and the various ways that they can be used and combined.
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"Fooling computers since 1972."
