tedster - 5:12 pm on Aug 5, 2010 (gmt 0)
I've speculated elsewhere (including our Updates thread [webmasterworld.com]) that since the Mayday update, Google is getting original source attribution wrong more often than they were, ranking the scraped or mashed-up URL and filtering the original. My theory? It comes from Mayday giving good rankings to "sites" they feel are more popular - and therefore better over all destinations for the search user. The emphasis used to be more on the "page" rather than the "site".
Now this does not necessarily fit in with a pure scraper site - but the lines between a mash-up, an aggregator and a scraper are blurring quite a bit these days.