We’ve received numerous messages about this new login popup on our site. This is NOT our doing. It is most likely some ancient script from our ancient template that has finally become outdated or expired. We’re working on a resolution. If you hit cancel it will go away.
We are truly sorry for the inconvenience and are working to get rid of this immediately.
Update: It is gone. It was a site statistics script from sitemeeter that suddenly had issues on many sites. We try VERY HARD to make sure our advertisements are unobtrusive since we rely on those ads to support us. Anything that gets in the way of you reading our site is bad.