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 Google Instant went live on 9/9, read industry experts opinions on how this will affect SEO here, including contributions from White Hat SEO Marketing.  

deep crawl - Whitehat SEO Marketing - Glossary

White Hat SEO Glossary Index

Google has two crawler types googlebot and freshBot. fresh bot constantly trawls the web indexing new pages, whereas googlebot indexes the entire web following new links periodically.