If you are looking into creating sitemaps for your website, here are some websites with information to get you started:
- Sitemap file differences explained (http://www.microsystools.com/products/sitemap-generator/help/website-sitemap-kinds-comparison/) (by Microsys)
- Visual HTML web sitemaps (http://www.trcompu.com/BuildingASite/WebSiteMaps.html) (by TR Computing)
- Google Webmaster Tools Blog (http://googlewebmastercentral.blogspot.com/) (By Google)
Remember, creating sitemaps for your websites does not guarantee you get all pages indexed, but will most likely help get more indexed faster. If you have a website with lots of content, this can really help you get into long tail search queries :)