Google's Mysterious Double Footer Bug

I have been puzzled by an apparent bug in the Google search results page for quite some time now, and I am really surprized by the lack of mention of it online (so maybe the problem is unique to me). Every time I search, the results page has a double footer. Take a look at this screen shot.

Does anyone out there have an explanation? Surely Google wouldn't let this sort of minor bug go for so long. Am I the only one who gets a double footer?

Details for the detail oriented:
- Using Firefox 1.5.0.6
- Searching from Google's personalized homepage and from the Google toobar.
- WinXP
- I skipped breakfast today