[I may have got the facts wrong, but the idea is correct, more or less.] Posterous started out life with the idea of posting by email. There may have been a way to post from the web when Posterous first started, I don;t recall, but what I remember pretty clearly is that there was no way to upload an image right from the web interface. There was a workaround whereby you could upload an image via email and then tweak the post via the web interface, but who wants to do that? Then the bookmarklet came out - and that was a good move forward for anything that was already on the web (images included). Then a little while ago I wanted to go in and tweak something I had posted via email and BINGO - the web interface is MUCH better - including image uploads.