Recently I changed my site improving the title and description metatags of many pages. Looking at Webmaster Tools I saw that Googlebot already crawled the new contents (and also found duplicate titles ...
In my Sitemap.xml file, I have the following line for every url: < changefreq > weekly < /changefreq > But the reality is that most pages don't change very often. Except there are new pages ...
I'm sitemapping all my forum topics. It works great: <url> <loc>http://127.0.0.1/scirranew/Forum/Breaks-and-slowdowns-Vram-200_topic32854.html</loc> ...