Posterous Tumblr Importer
Currently a tumblr user but want more features like comments and moderation? If so, click through the link above and fill out in the information on the “switch” link.
Personally, my main update site is Posterous, which I then use to update tumblr. Why? I have friends/family that are on tumblr and want to share my content on their platform of choice. To me, this is one of the strongest features of Posterous, “autopost to everywhere”