Most of the content farming sites was severely effected by Google new algorithm update for low quality content Sites. The ranking of the popular sites have dropped. Now, does this mean that inlinks gained from these sites do not have any weightage.
Most likely links from article sites and content farms already didn't have much value for helping Google rankings even before Panda. And it's logical that they would have even less value now. In fact some people think that all backlinks may have less value now. But all of this is in an area that's difficult to analyse, so it's hard to reach any definite conclusions.
Based on my experience links from Panda sites still have some weight. You can argue if they have the same or less weight but the links still have some weight.
You could even argue that in some instances links from a Panda site now carries more weight. If a PR 5 Panda site with 1000 sites linking to it, cleans up its site and deletes 90% of its pages then it is possible the link juice is now more concentrated for the remaining 10% of the pages.
I think Panda has helped some people realize that easy links are typically not valuable links. You should seek out quality, relevant, editorially approved backlinks. Chasing after article sites, forum signature links & free directories will boost your link count but probably not significantly boost your ranking power.