At Helium you can write articles, enter writing contests and apply for writing jobs that you can find in the Marketplace. Helium also pays you 5% commission on the earnings of writers that you have invited.
Here you can publish and sell your books or e-books, as well as calendars, posters and a variety of other materials.
A site which lists lots of writing jobs available to bloggers.
A great blog with all kinds of information and advice about writing.Writer's Weekly
Lots of tips and information about freelance jobs.