Yahoo! has launched the upgraded web crawler - Slurp 3.0. This new Yahoo! Slurp 3.0 recognizes the same user-agent and all robots.txt directives for 'Yahoo! Slurp,' though it'll identify itself as Slurp 3.0 in your web logs and statistics but would not recognize directives specific to "Slurp/2.0.".
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I hope, this new crawler will be more efficient in crawling web pages and we could get more good search engine results.