Writers and agents both have to be good salespeople to make money.
Joanne Tomarkos blogged about What Good Salespeople Know That Writers Should, a guest blog at Jane Friedman's blog, Being Human at Electric Speed. #1? Believe in your product. That means you as a writer.
Want to set up something you can sell? The Passive Guy reposted a blog Dean Wesley Smith wrote about getting insulted by an editor. Smith gives some interesting insights on marketing and maybe a marketing plan if someone writes fast enough. [Not me.] The comment that snagged my interest? Two years is an "age ago" in publishing.
Of course, if all that marketing [aka selling] is stressing you out, Pat Stoltey at the Chiseled Rock blog has a list of de-stressers. They even don't cost an arm and a leg. Just get them moving.
What websites help you the most with your writing?
Angela Ackerman at The Bookshelf Muse gives you the link to nominate sites for the Writer's Digest best website listings.