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tedster - 5:02 pm on Jun 11, 2007 (gmt 0)
Google publishes information on SiteLinks (extended listings) [webmasterworld.com]
You're talking about what Google calls SiteLinks. Here are some of the best previous threads about them:
Extended site description - what makes the extra sections happen? [webmasterworld.com]
Does Google Sitemap help to get "extended listings" [webmasterworld.com]