Yahoo dumps Google. They're powered by their own search engine now, thanks to the acquisitions the made last year. It's amusing to see how the browser wars have turned out. In the very beginning, we had the following players:
Altavista - One time leader in the websearch engine. Commited harakiri by tranforming into a portal, among other things.
AllTheWeb - Indexes a LOT of pages. I used it for pages I couldn't find anywhere else. But that's about all I used it for.
Yahoo - Search, mostly dependent on the then-huge human-managed directory. Plus points: search quality, and portal features.