It has been proven that Google will spider your site faster if you have a Google Sitemap. In its simplest terms, a Sitemap is a list of the pages on your website. Creating and submitting a Sitemap helps make sure that Google knows about all the pages on your site, including URLs that may not be discoverable by Google’s normal crawling process.
Note: Most of these sitemaps are valid for Yahoo as well!
TOP FREE Online Google Sitemap Generators
1. GSiteCrawler
2. XML-Sitemaps
3. Sitemaps Pal
4. XMLEcho Sitemap
5. SitemapBuilder.net
Other popular Free Sitemap generators are –
6. HotWebTools
7. SitemapDoc
8. SEOImage
9. MakeASitemap
10. Sitemaps-builder
11. dtools.net
12. Ongsono
Any more to add to the list? Have you used any of these? Which one do you recommend?