Here ya go........ http://www.retrievertraining.net/ This forum is geared more towards field trial stuff but good info nonetheless.

http://refugeforums.com/refuge/forumdisplay.php?s=&forumid=9 This one is geared more towards hunting retrievers.

If you have any specific questions after you poke around a bit, let me know.
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Not all who wander are lost...