There are lots of them on YouTube and on Google. I can't post all of them here. Official Adobe Help Page a good start IMO. That's not a problem. We do it all the time, but try to use known and trusted sources like Tuts+, Photoshop Training Channel, and TipSquirrel. Even the 'You Suck at Photoshop' series are OK, and funny into the bargain. Mike Hoffman from TipSquirrel is a regular poster to these forums, and Jesús Ramirez from the Photoshop Training Channel is known to a good few regular posters here like Chuck and others. But so long as you think the tutorial has good production values, go for it.
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