quantobasta - 6:19 pm on May 9, 2004 (gmt 0)
I believe the appearance of serps jumping around is a result of multiple yahoo databases. I have noticed different sets of serps correspond to the ip that search.yahoo.com is forwarding to. One way to see what ip you are currently accessing is to ping search.yahoo.com after your search. So far I have only seen two ips, 188.8.131.52 and 184.108.40.206 but I imagine there are more. The serps I get from each are different and one is not a subset of the other.