Unfortunately, I still run into a myriad of copy/paste sites, which when compared against Exerpts Exchange, are far worse, and Google's UI has made it less simple to ban the sites. I've had to manually block "unifiedpeople.ru", "mvp.itcommunity.ru", "boardreader.com" and "efreedom.com" in order to clean up search results related to topics I'm regularly seeking answers. They generally copy/paste from a variety of forums (and maybe even legally so), but they present a less up-to-date version than the site they're copying and often the code highlighting and other formatting is completely stripped rendering a very difficult to read result. Yet they often rank higher than that from which they copied.
The sites are marginally useful and were a problem before and after Panda. Google, being in a very powerful position, does have a lot of control over things like this, however, they also are going to be the most targetted. I've found, in some cases, their closest competitor (the one that used to be very blue) occasionally provides cleaner results, especially if the query involves their own products--a circumstance that was not always the case.