I've had great experiences with Freelancer.com. I've got a few quick and well-paying jobs off of there. Never had experience with Elance or oDesk though, but they're all similar to be honest.
The best freelance clients I have worked with have been from personal recommendations. Tell every friend who works in software that you are free for work - many of them will be approached by people looking for developers, and can refer you.
Also, look for technology-specific mailing lists, forums and job boards (and stackoverflow careers). The people looking for developers there tend to be more familiar with the process, cost and expectations of hiring a developer than people on "outsourcing sites".
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[ 2.9 ms ] story [ 20.5 ms ] threada. https://www.elance.com/
b. http://www.freelance.com/en/
c. http://www.freelancer.com/
d. http://www.getacoder.com/
e. http://www.guru.com/
f. https://www.odesk.com/
g. http://www.peopleperhour.com/
h. http://www.project4hire.com/
Also, look for technology-specific mailing lists, forums and job boards (and stackoverflow careers). The people looking for developers there tend to be more familiar with the process, cost and expectations of hiring a developer than people on "outsourcing sites".