OS X does a great job of integraging blogs with LDAP authentecation. Unfortunately it doesn’t provide an easy way to go in and delete blogs. It appears that actual blog content is kept in
/Library/Application Support/Weblogs. However deleting a blog from this directory will only erase the blog entries. Any blogs that were created will still show up.
/Library/Tomcat/webapps/blojsom/ROOT/WEB-INF/blojsom.properties has a list of everyone who has an active blog. Deleting the names from this list appears to remove them from the listing that shows up at [server-name]/weblog. There are also individual settings in this folder that control the settings of each individual blog.