I use the Microsoft SEO toolkit, its not so much dynamic, but you can just click the pages you want included. i think this is better as Duane Farrester said on white board friday, you should not include every page in your sitemap. just the main ones. If you list every page it is likly your site map will be ignored in future.
I asked Duane about this at bing, and he suggested that this is only so with large sites, if you have a small site of 10-20 pages then listing every page is not a problem. but all the same i only list useful pages, i dont list contact page, policy pages and the like.