If you're looking for a writing group, you'll find links to them on the Find A Writing Group page, but there are plenty of other useful sites /resources for writers on the net.
Write Around the World
The FindAWritingGroup.com's blog. Here you'll find links to useful and/or interesting journal entries about writing in general as well as guest posts from writers, editors and agents .
The FAWG community on Live Journal
An online 'coffee house' where writers from around the world can swap ideas, share their experiences and get to know each other a little better.
Nathan Bransford, literary agent
An excellent writing blog for writers of all skill levels and experience.
The Blood-Red Pencil
Great advice from a team of editors and writers.