Is that so? I was going to link a news article or two, but filtering out all articles claiming that Google are more popular at the moment because the others don't have good enough search algorithms, I arrived at the conclusion that there are no good articles!
Sure, for users, the switch from Altavista to Google went from 5 searches per single relevant hit to almost always producing several relevant hits on first search. But the switch from Google to MSNYahooLive! wouldn't markedly improve the search results for users, no matter how relevant results the new algorithms produced. Peripheral services on the other hand, if MSNYahooLive! were to outcompete Google on one of those, then maybe that would get the users to also use the MSNYahooLive! Search at the same time. Not that I think that likely, with the way Google have integrated Google accounts from GMail to include every possible service they could include without breaking the service for other users.