In addition to those hosted services, is all of the self-hosted Wordpress, Joomla, Zencart, etc. Plus all of the business and personal sites built on Zend, Symfony, Cake.
And most of those Wordpress/etc installs are going to be of applications which assume they're in a normal hosting environment, where they're running on Apache with a filesystem they can write to, connecting to a MySQL server, etc. How well will this translate to GAE? I'm not sure.
