This is a tasty little snack that allows you to easily add referrer tags to your Community Server posts. Download the code, add to your site's /bin folder and follow the rest of the simple directions found here:
http://sharepointsearch.com/cs/blogs/site_admin/archive/2007/09/15/adding-refer-digg-technorati-links-to-community-server-blogs.aspx
You can see it in action at the bottom of this post!
I posted a while ago about a neat CS 2007 add-in that automatically adds referrer tags to your posts