it's funny you say that.  i've often thought over the past year or two that the main things that stop a content community from cropping up around Blender the way it has Poser and DS are an interface for movement like the parameter dials (one already existing for morphs) and support for a library structure and an interface for it.  i know that you can link and append items from another file, but considering that a Blend file isn't the best way to store as much as i have in even one of the main content directories in one of my Runtimes, and material zones are renamed if an item with the same material already exists (annoyingly), it's more of a rudimentary solution than a full-fledged one.  a more robust, centralized library system that multiple versions of Blender could draw from would make it easier to share the already copious freebies and collaborate on movies, as well as support a content community.