This site http://www.flamingpear.com/ has plug-ins, some are free to try.

Nat'l Assn. of Photoshop Professionals - http://www.photoshopuser.com/ It is an amazing site, but you must pay.

http://www.ultimate-photoshop.com

I will see what other links I have.
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I don't measure a man's success by how high he climbs but how high he bounces when he hits bottom.
--General George S. Patton