My online writer's group, CoC is gathering a few of our writers to tackle the NaNoWriMo competition for the third year in a row. We've got our NaNoWriMo thread established if there are any writers interested in a great support network:
CoC Koffee Klatch @ NaNoWriMo
CoC has a great forum and password protected safe online archive for workshopping novel length works. If you're looking for a great group of folks who aren't afraid to offer their honest opinions on your work and who is incredibly supportive, please feel free to join us:
CoC Online Writers Group
I have been writing with this group online for more than five years, and they are really wonderful people. Join us!