I'm in the process of building a sitemap generator for the ubb; I'm not sure if it'll be public or not at this point; but you can see my demos at:
http://www.undergroundnews[dot]com/sitemap.php?type=1&se=2
http://www.undergroundnews[dot]com/sitemap.php?type=2&se=2
http://www.undergroundnews[dot]com/sitemap.php?type=3&se=2
http://www.undergroundnews[dot]com/sitemap.php?type=4&se=2
http://www.undergroundnews[dot]com/sitemap.php?type=5&se=2
Please note that i commented the . out because i don't want the links indexed by bots that don't respect robots.txt as i have a laggy server and things crash well lol...