We have written a tremendous number of stories on the Google Panda update - a tremendous. So stating that Google's Panda update goes well beyond targeting content farms is likely obvious to many but it is an important note.
A WebmasterWorld thread has one member who spoke with Matt Cutts, Google's lead of web spam, while at PubCon and he said that Matt told him that the Panda algorithm was originally aimed only at content farms but has gone well beyond that.
Whatson, a WebmasterWorld member since 2002, said that Matt told him, "it [Panda} was targeted at content farmers but has gone much further than that."
We all now it was originally released to target content farms, which is why Danny Sullivan named it the Farmer Update originally and then Wired told the story of the internal name, which was Panda. But at some point, the Panda update went well beyond just targeting content farms - when exactly is not clear, but most would agree, Panda is more than a farmer update.
Forum discussion at WebmasterWorld.