I haven't had any of my personal sites slapped with Panda, but I wouldn't be surprised if they were using toolbar data to some degree. Just a heads up to everyone, though. One way to circumvent Panda if you want to experiment is with subdomains. Hubpages was able to do it.
Hubpages data for one of my hubs before and after Panda and after the implementation of author subdomains.
Pretty interesting stuff.