We’ve received various messages about this new login popup on our site. This is NOT our doing. It is many likely some ancient script from our ancient design template that has finally become outdated or expired. We’re working on a resolution. If you hit cancel it will go away.
We are really 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 all of a sudden had issues on numerous sites. We try very hard to make sure our advertisements are unobtrusive because we rely on those ads to support us. Anything that gets in the way of you reading our site is bad.