world3d - 4:31 am on Mar 24, 2004 (gmt 0)

Just returned from vacation to find that my site, which was #1 for all of my key terms, has been dropped all but completely. It has been replaced by the Overture listing at about #8.
What the heck is going on? Could it be that Yahoo identifies advertisters and drops them from the natural listings in anticipation of them being submitted to site match?
Or is this Yahoo's version of Florida?