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Why don't the pages that Googlebot crawled on my site show up in your index?

Don't be alarmed if you can't find documents that Googlebot has crawled from your site in the Google search engine immediately. The documents will be indexed and entered into the search database soon after being crawled. Occasionally, documents fetched by Googlebot will end up not being included in the index, for a variety of reasons (e.g. they appear to be duplicates of other pages on the web, etc.)

http://www.google.com/bot.html#notinindex