NOODP != nofollow.
http://www.google.com/support/webmasters/bin/answer.py?hl=en...
One source we use to generate snippets is the Open Directory Project. You can direct us not to use this as a source by adding a meta tag to your pages.
To prevent all search engines (that support the meta tag) from using this information for the page's description, use the following:
<meta name="robots" content="NOODP">
EDIT: oops, I missed the
tag, which will hopefully take care of it, although I'm not sure about its placement inside a HTML comment. Will that work?