Google XML Sitemaps

This plugin will generate a special XML sitemap which will help search engines like Google, Bing, Yahoo and Ask.com to better index your blog. With such a sitemap, it's much easier for the crawlers to see the complete structure of your site and retrieve it more efficiently. The plugin supports all kinds of WordPress generated pages as well as custom URLs. Additionally it notifies all major search engines every time you create a post about the new content.

Installation:

1. Upload the full directory into your wp-content/plugins directory
2. Use your favorite FTP program to create two files in your WordPress directory (that's where the wp-config.php is) named sitemap.xml and sitemap.xml.gz and make them writable via CHMOD 666.
3. Activate the plugin at the plugin administration page
4. Open the plugin configuration page, which is located under Options -> XML-Sitemap and build the sitemap the first time. If you get a permission error, check the file permissions of the newly created files.
5. The plugin will automatically update your sitemap of you publish a post, so theres nothing more to do 

Download  Google XML Sitemaps
This release is not compatible with the new multisite feature of WordPress 3.0 yet. The plugin will remain inactive as long as this feature is enabled.
This release is compatible with all WordPress versions since 2.1. If you are still using an older one, use version 2.7.1 instead.