
Are you using an Apache clone?
It could be a plugin interfering, but the rewrite-free variant ( http://techtalkin.com/misc.php?google_se...ads&page=1 ) works fine as opposed to the rewrite variant ( http://techtalkin.com/sitemap-threads.xml?page=1 ) which does not work. So it seems to be missing the page parameter after the rewrite, but with a rewrite rule as shown above and with Apache (any version I'm familiar with) this is not possible.