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Maybe http://dribbble.com? I don't have an account, but it seems like that give you what you are looking for and have a niche group as well.

I came in here to mention this, but it is invite-only to keep the quality high, so it might not work for the OP.

It's great for inspiration though.

I looked at that. I quickly realised that they would hate me. A developer asking for design feedback.