Under the “interesting niche job website” category, looks like Voices.com, a voice over industry website matching voices to voice-needers, has come out of beta and is now available to the public.
It’s essentiall a job site, but focused on matching those who do voice work with those needing voice work. You can browse around for particular voice styles or build a profile and put your voice online. If you need someone to do voice work, the job posting side of things is free. Here’s a screenshot of the simple homepage:

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