What about Plugin for SiteMap Generation?

To really make this function work it should literally be a part of CMSB. One of CMSB's power features is building pages on the fly as the user/owner changes the site. The sitemap generator function needs to be able to update the sitemaps just as quickly as the pages are built and actually change the file on the domain. (set as a daily or bi-daily cron job so it's not always hammering the server). If it runs only when someone decides they want to run it, then that defeats a major part of the purpose of having this function built in. Without such a function, an administrator has to use a third party to create the sitemaps and then ftp/upload the sitemaps to the site. Having it built in to the system is what's needed so the whole process is done seamlessly and regularly. For most CMSB sites, CMSB already builds all the pages so it's a natural fit. CMSB is already on the server and has access to depositing the sitemaps right into the root directory.