I almost switched to WP after even worse issues in Joomla, but you are making me think again now. In order to have SEF URLs, we had a component issue creating URLs that were actually non existent so that Google indexed non existing pages and kept reporting 404 error each crawling. It was building up to more than 900 pages and we finally decided to kill the component to be SE friendly again. Now, since mattcutts talked me into WP here is an issue that I would hate to face, so please report here if anyone cured this problem. Thanks.
