Yaaaay! I was using Gmail as a Posterous blog post editor (because attaching images and mp3's and then sending them to Posterous resulted in beautiful posts, something confusingly less possible with the web editor.). Anyway, I had no doubt they were cooking up something for the web editor... not because i had inside information, but just because they seem extremely thoughtful and in touch with how people actually work. (They prioritized email/mobile editing... fair enough. And probably smart, though less applicable to me.) Keep up the great work, Posterous folks!