Posterous looks fascinating. Many blogs are using it. I was considering switching from tumblr to see if there were compelling benefits. But this campaign turne

Posterous looks fascinating. Many blogs are using it. I was considering switching from tumblr to see if there were compelling benefits. But this campaign turned me off; Posterous, by claiming it is the successor of all blogging software, makes me suspicious how they will react when someone comes along to obsolete them. If they're in it to win, how do I have any assurance I'll benefit from their service if they "lose"?