This dynamically builds a googlesitemapindex and corresponding googlesitemaps for your CS site.
I built this control a while back, guess I have been hiding it, more of an oversight on my end (never published it) we use it here on http://communityserver.org/googlesitemapindex.aspx and http://blog.danbartels.com/googlesitemapindex.aspx basically this control adds a dynamic site index and site map pages to your site. It iterates through every forum, gallery, filegallery, and blog on your site, exposing each post. It auto pings google when you update content, and works with CS security, such that an admin user could potentially see more posts, than say the googlebot. Its a very easy +1 for your pagerank.
This control is designed to work with CS 2.1. Binaries are built with 1.1 and work for both framework 1.1 and 2.0.
Here is a thread in Addons, which is a good place to get the latest issues and updates..
http://communityserver.org/forums/528226/ShowThread.aspx#528226
Dan