After months of speculation, the top-secret Amazon.com venture A9.COM unveiled a test version of its new search engine--well, sort of new. Searching the site calls up results from Google while simultaneously finding books on Amazon. Here's what's new: for each site your search uncovers, A9 spits out a list of related ones based on what other people liked. It's similar to what Amazon already does for books--and A9 hopes it will become just as popular. --By Joshua Macht
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