cline - 1:23 am on Apr 8, 2005 (gmt 0)
If multiple people edit the site don't forget the possibility that something *was* done that caused the ranking change. I had this happen recently to a site. A casual observer wouldn't notice any change in the homepage, but somebody (and no one is owning up to it) made several little, mostly non-obvious changes detrimental to SEO. I restored the page to how it used to be and the site went right back to its former ranking.