If you haven’t tried Posterous, you should. It offers lots of great features. Recently, Posterous added a new feature on its theme. If you open Posterous-powered sites using mobile device, they will be presented in a nice interface. You don’t have to tweak any settings, it just works.
From their blog:
This mobile theme was designed with readability in mind. We stripped out as much as we possibly could, and ended up with a very minimal mobile theme that we think you’re going to love.
In addition, we optimize all of your uploaded media for smaller screens! We automatically resize your image galleries and videos so that viewers on smaller screens can have the best experience possible.
When I create a new post using Posterous, I also cross-post it to Twitter, or — sometime — Facebook. By this new feature, those who use Twitter in mobile don’t have to worry about loading heavy page on Posterous. Nice.