Matt Cutts says:
To direct all search engines that support the meta tag not to use ODP information for the page’s description, use the following:
<META NAME=”GOOGLEBOT” CONTENT=”NOODP”>
or
<META NAME=”ROBOTS” CONTENT=”NOODP”> for any other search engine as well
http://sitemaps.blogspot.com/2006/07/more-control-over-page-snippets.html
