Free blogging service Posterous is simple to use, but posts several types of content via e-mail or web: video, audio, pictures, and documents. For some users, though, they might prefer more enhancements to the interface, or a mobile app. For them, and the developers that cater to them, there's the newly updated Posterous API. A complete replacement and rewrite to the previous version, this allows a lot more access to developers, including administrative options like adding sites and users.
Sometimes we forget what the real purpose of all this fancy technology is. And what is that? To make our real lives easier. Mashups often help with that, allowing us to do such simple things as find a good beer, our favorite music artists, where the streetcars are, or where a park is.