Request: Sitemap Plugin
Unfortunately, due to the flexibility of CMSB and how it lets you create any number of viewers, there's no easy way to create a sitemap. The URLs of all the viewer pages aren't tracked in the CMS. There are a few posts on doing it manually if you search the forum, though. In the past when I've made them I've had it generate the site-map on run and cache the result for x minutes.
Hope that helps!