For the week ending Oct. 30, 71% of US Web users went to the top 10 search engines, a 7% increase YTY, Hitwise reports. Collectively, five alternative search engines – Vivisimo, Clusty (property of Vivisimo), a9 (property of Amazon), Alltheweb (property of Yahoo!) and Snap – claimed only 10% of total visits to search engines and directories. Four alternative engines each delivered 7-8% of their traffic to shopping and classified ad sites, while Google, Yahoo Search and MSN Search each delivered about 10% of their traffic to such sites. Search engines a9 by contrast sent 18% of its overall traffic to shopping and classified sites, influenced by its affiliation with Amazon.com.