I don't quite get this. It seems to conflict with their existing import and offers a different set of services to import from. If you have an account, you can

I don't quite get this. It seems to conflict with their existing import and offers a different set of services to import from. If you have an account, you can import from Tumblr, Blogger, Wordpress (even a self-hosted Wordpress, Movable Type, Xanga). If you go to the URL at the link above (http://posterous.com/switch http://posterous.com/switch), it allows you to import from Tumbler, Ning. I'm assuming they will ultimately be the same set of services.