They have (built-in) commenting. XD Seriously, I don't really see how this will benefit Typepad much. Vox seems like a failure (not sure why Vox failed), and there's a lot to be gained in this field by being first and fairly good... (Posterous seems to me to not really be a Tumblr clone because of their lack of reblogging and obsession with Twitter (and other) integration)

Interesting! Do you have any English language info on how this works technically? Like it's some kind of cross-platform protocol? Maybe like a souped-up ShareThis?