First of all, I like them both. I once started with Mootools and build a site with it using the scrolling function (http://www.hapjestheater.nl). Some time later I got known to jQuery and now I can say it fits my needs better. I've never been very good with javascript and jQuery seems to be more understandable to me.
Nice article. Indeed a good way to set up your sitemap. You can use the Google webmaster tools to tell google about your sitemap. After that Google will keep downloading the sitemap again and again! Works very well... Allthough it should not be necessary for your site to be indexed completely...