Topic: The new robots-nocontent tag
Thought this might be interesting for separating navigation stuff and content on forums.
For over a decade, search engines have supported standards allowing you to prevent pages from being spidered or included within a search index. Today, Yahoo now supports a new twist -- a way to flag that part of your page shouldn't be included in an index. It's called the robots-nocontent tag.
http://searchengineland.com/070502-132315.php
--Alan