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There are innumerable training DVDs on Photoshop on the market these days; among the most popular are those by Deke McClelland.
Depending on the version of Photoshop you're using, you can find more info about them at either Lynda.com or Total Training.
And you can learn all kinds of interesting stuff about Deke at his own website, (including his new music video--that's right, *music video*) right here:
Hoping this helps; all the best....
Executive Editor, O'Reilly Media