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Interactive Voices isn't quite what I hoped it would be, but it's interesting nonetheless. The service is trying to be a "voice over marketplace" - a place where you can find voice talents for your radio commercials, radio ads, audiobooks, cartoons and the like. From the site:
InteractiveVoices is a web 2.0 company and the global leader in connecting clients with professional voice actors and voice-over talent. Radio and television stations, advertising agencies, marketing executives, casting directors and voice talent agencies rely upon Interactive Voices’ marketplace to search, audition and hire professional voice-over talent with the assistance of a web-service.