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Key_Master - 1:52 pm on Jul 9, 2008 (gmt 0)
I only use rel="nofollow" for url drops in forums and for spider traps. On "Contact Us" type pages, I use the meta noindex,nofollow tag and never had a one show up in serps, Sitelinks or otherwise. [edited by: Key_Master at 1:53 pm (utc) on July 9, 2008]
Google Sitemaps allows you to block links from showing up in Sitelinks.