Just to say, I’ve put some thoughts about screen-scraping and intentionally embedded semantics (POSH), and what I see as the pros and cons of each, here: http://doofercall.blogspot.com/2008/05/screen-scraping-and-posh.html.
The post sort of plays hoard.it against my experiment with a pseudo-microformat, not in opposition but to explore where the two approaches are strong or otherwise. Obviously there’s not actually an opposition, but there are certainly differences in what they require and what they enable.