They  have just released another significantly improved version of AceSEF component.

Again, it introduces several new major features. Most important is Sitemap (XML), that can help increase your site's SEO by generating a XML sitemap.

You can create a sitemap in XML format for ALL components without any plugin obligation. In contrarily from other Joomla! sitemap components, you can manage ALL sitemap's items, can set different date, frequency, priority or include/disclude each sitemap's item.
The sitemap is saved in a static XML file which is the best method for spiders to find/crawl your sitemap.

This is the latest stage of a complete Joomla! SEO Suite. With AceSEF you can generate nice SEF URLs and manage them easily, can manage all metadata in one screen in batch mode, can generate XML sitemap and ping it to Google.