Do you subscribe to TwelvePoint.com? You should. Lots of interesting articles, friendly forums, and advice from experts on all aspects of screenwriting.
I've been busy recently and visited the site earlier for the first time in a week or two. I was delighted to see an article on the front page by the scribosphere's own Jason Arnopp on the merits of blogging - and a very good article it is, too.
Are you a registered user? If so, check it out: Why every writer should have a blog.