In great news, Google, Yahoo and MSN have agreed upon a XML sitemap standard.
What’s this mean to you? Well, you just need to create one XML sitemap and you can submit it to all three engines. I’ve been doing that for a while and didn’t seem to have any problem but now it’s official.
Why should you create an XML sitemap? An XML sitemap outlines all the URLs on a site so that search engines can find them all easily. Much like a normal sitemap, it just lists all the pages however, an XML sitemap is optimized for search engines, not for people. By giving search engines a list of URLs on your site, you are increasing the number of pages they know about and can refer traffic to.