About every six months, I actually do add a feature to the web sites. I added a new page that shows any new entries for the community directories. For example, here is the new listing for Grand Junction, Co.
Realizing that I was getting a penalty for using excessively long site maps, I cut the full directory listing from the site map, then put a link back to the original map. I exclude the original map from the search engines: Here is the new site map for Salt Lake City. Here is the old map.