YES!!! Omg, we're actually discussing that over in the forum. It's a hot topic at the moment. I think, from what I've read today, the last panda update is what hit most of us that have commented in the forums about decreased traffic. It really doesn't help inspire you to write when you see your traffic fall through the floor. I almost threw in the towel completely earlier.
Hubs missing from Google - Keyword results = 0 is the title of the topic in the forums