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I just read We don't need no Pagination, which describes a technique to replace the read more of a page with an automatic page loader for the next section. I think this could easily be done in Drupal, maybe as a plug-in for Views and teasers.
As a start, I could easily envision teasers automatically loading the rest of the content on mouse hover. Or a page view loading the next batch of results when scrolled to the bottom. Probably other uses as well, although they might be more theme/site specific.
Is there already something that does this? If not, I'll probably start a new project for it. Maybe something like Automatic Page Loader or something...