Good news from Google’s Webmaster Central Blog today, a better way to build out your xml sitemaps.
we have created a different kind of Sitemap generator that uses several ways to find URLs on your website and then allows you to automatically create and maintain different kinds of Sitemap files.
Our new open-source Google Sitemap Generator finds new and modified URLs based on your webserver’s traffic, its log files, or the files found on the server. By combining these methods, Google Sitemap Generator can be very fast in finding these URLs and calculating relevant metadata, thereby making your Sitemap files as effective as possible. Once Google Sitemap Generator has collected the URLs, it can create the following Sitemap files for you:
I’m going to install this on a few of my sites as a test over the next few days and report back on how it goes.