I was a fan of Amazon's A9 search engine, until they silently switched from Google to Micro$oft (greased palm no doubt). Still, it's amazing how different search tools find and present infomation (rather than searching three times in Google, try two other engines). Some engines use "clustering" or hierachical key word nodes, while others allow a quick "peek" at the web page, and/or a thumbnail view. Still others enable filtering by document type, or modification date, and even more exotic analysis strategies. After trying many of them, I think the best are Exalead (clustering, thumbnails, doctype and mod date), Findforward (thumbnails, and LOTS of different search tools), KillerInfo (clustering, and peek), and Mozbot (nice interface, thumbnail rollover, keywords, recent files). There are perhaps a hundred search engines out there, but here are my picks:
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Other search engines of interest:
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And, in categories all their own:
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