I joined a local camera club,
The Leeds Photographic Society which is the oldest Photographic Society in the world founded in 1852, just about a year ago.
I think it has really expanded my photographic horizons. The judging comments have been useful and sometimes even helpful and the contacts I have made has been very good and I have been on a few local trips with members that was very enjoyable. I have actually only entered about 2 competitions myself but I have enjoyed looking at other submissions.
This is the only photographic forum I am a member of and that has been very helpful, however I have mentioned before there is not often much negative comment on an effort and I think societies and clubs tend to produce more direct feedback which if both given and taken in a constructive manner can benefit the photographer.
I have started a poll just to get some numbers (and because I fancied starting a poll)