Everybody knows that if they don't control the domain where their blog is or the domain where their email is, they have no control. Which of course is as true for IM and for the up and coming market for cross media presence as it is for email and blogs. Some combination of Atom/APP and Jabber (with SMS, RSS, etc. gateways) should solve this issue - but it needs to be packaged and included in Wordpress and Moveabletype - and hosted by commonly available webhosts, simply part of the standard makeup of a webhost. Including the option to download a usable archive of everything in one file.