aristotle - 10:57 am on Aug 4, 2010 (gmt 0)
This was always a sometimes problem - attributing original authorship on the web is a challenging problem. But if there is more of a problem now, as it seems, it started around Mayday - and that alog change was designed to emphasize "sites" that make good destinations for Google Search users, more than just ranking pages. Ar least that's what some Google spokespeople seemed to be saying.
Tedster - The implementation of Caffeine was supposed to enable deeper and more frequent crawling, and it seems to me that this would improve Google's ability to identify the original source.
Or are you suggesting that Google is intentionally promoting more established trusted sites even when they know that another less-established site was the original source?