I used to belong to a lot more than I now do, I've curtailed my online time pretty drastically.
Currently there are only 3 I am active at all on:
DPReview, but less and less every week. Sometimes I don't post there for a week or more. I'd say 90% of my online photography time is spent here.
Here
and finally a site dedicated to fantasy fiction, and more specifically the
Wheel of Time series by Robert Jordan, tho they do have message boards dedicated to other fantasy as well.
wotmania: feed your wheel of time addiction
NaCl(actual photography takes up too much of my time now)H2O