Here are a few online sites that post information about paying gigs for freelance writers.
1.allfreelancewriting.com: Browse by category or specific freelance markets.
2.duotrope.com: Detailed descriptions and market database for the perfect place to submit what you write. Lots of short story markets as well.
3. freelancewritinggigs.com: daily postings of the latest freelance opportunities.
4. fundsforwriters.com: Information about grants, contests and other ways to get paid as a writer.