The retouching forum at dpreview.com is fairly active, but the % of novices is high compared to those with more advanced skills. Not much emphasis on in-depth how to, but frequent links to tutorials elsewhere.
Although participants tend to be mostly amateurs and casual shooters and there are a lot of "photo-art" C&C-type threads, it's still a good info source.
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zog, insensitive: What needs/interests are
"not being fulfilled here" at
RP that you hope to find elsewhere?
Maybe I can help.