From Emergency Soft:
Sitemap Writer Pro is a software tool that allows you to create and keep up-to-date sitemaps for your websites. Sitemap Writer Pro makes creating and editing a sitemap easy. With this program you can automatically generate sitemaps for your websites, edit them, upload to web server and submit to all search engines that support sitemaps (Google, Yahoo, Ask.com, and MSN).
Within minutes of downloading the software I was able to generate a Sitemap for the smallest of my several Web sites. I thought of writing my own and looked at various products, chose this on a hunch partly because the price is reasonable. I expect it will do fine on my larger sites as well.
It was really stingy on what you could do for free. I would have felt more confident paying for it if it had done more in the free version. Maybe make it fully functional for a small web site, with less than 100 URLs.