Outsourcing to Freelancers for Capacity Building

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Outsourcing to Freelancers for Capacity Building
For some, outsourcing is bad practice. But for the freelancers being hired, outsourcing gives them a way to make a living, working at tasks they enjoy, often from home based offices, and setting their own schedules.  For small to medium size organizations, outsourcing certain tasks to freelancers gives the company or nonprofit the flexibility to build capacity as projects or seasonal demands warrant.

Here are some places for organizations to find freelancers -- and for freelancers to offer their services:
<ul>
<li><a href="http://www.elance.com" target="_blank">Elance.com</a></li>
<li><a href="http://www.freelancer.com/affiliates/towelandbasin/" target="_blank">Freelancer.com</a></li>
<li><a href="http://www.guru.com" target="_blank">Guru.com</a></li>
<li><a href="http://www.kqzyfj.com/click-7049652-10713612" target="_blank">oDesk.com</a></li>
<li><a href="http://www.dpbolvw.net/click-7049652-10941838" target="_blank">99Designs.com</a></li>
<li><a href="http://www.getacoder.com/affiliates/ref.php?u=serving" target="_blank">GetACoder.com</a></li>
<li><a href="http://www.iwriter.com/affiliate/110527" target="_blank">iWriter.com</a></li>
<li><a href="http://fiverr.com/" target="_blank">Fiverr.com</a></li>
</ul>
What other sources have you found to be valuable? What has been your experience as a freelancer or using freelance contractors?