Click on any of those buttons and search results will now highlight items that are specifically from that search engine in a column to the right.Why would users want results from several different search engines?Search engines will return dramatically different results for the same search query.Dogpile's Image Search brought back good results, including better search query suggestions.The Yellow and White Pages searches are standard, with fields to search by business name, individual name, etc.Throughout all these various searches (except for the Yellow and White Pages), the ubiquitous "Are You Looking For" feature is always there, steering users to better-worded search queries.
I thought it would be worth compiling notes comparing how relevancy is defined by each engine (or how I perceive it based on my experiences).
Things that help you rank in one engine could preclude you from ranking in another.
There is enough traffic out there that it might make sense to do ultra aggressive SEO on one burnable site for quick rankings in MSN and Yahoo!
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Many people think a search engine is broken or their site is banned if they do not rank in one engine while they rank great in others.