I am running the alpha version of Google XML Sitemaps . Instead of writing a sitemap file to disk it now dynamically generates them. For example:
http://example.com/blog/sitemap.xml is generated dynamically.
I have tried to exclude this from w3tc page cache by adding the following regexs to the "do not cache box".
But they don't work and I cannot figure out why! w3tc is still caching them.