It only posts job listings, and doesn't serve the need for a directory of talent who are looking to provide services, contract/freelance, part time or full-time.
Freelancer, elance, oDesk, etc. will not start offering Bitcoin as a payment method until they face competition that does.
They are aware of Bitcoin, definitely. Here's a talk by Michael Levinson, VP of Product, oDesk. Notice that the bitcoin topic just keeps coming up over and over by those in the audience.
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http://vimeo.com/29287295