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According to TheAlarmClock, Treedia Labs is about to wrap up $5 million in round B funding. If the name doesn't ring any immediate bells, don't worry, they're better known as podcast.com and videocast.com. Both systems are platforms developed to deliver audio and video via RSS feeds to users.
The destination sites don't seem as much a priority, but they are both designed to help people get their casts out to more people, help users find them and also teach people how to start creating both forms of media.