It’s got everything you’d expect to see in a mobile blogging tool. Namely: a big green POST button that’s everywhere in the app; no matter what else you’re looking at, you can always start a new post with one tap.
There’s support for uploading photos and videos too, and you can adjust the quality settings for these depending on what kind of mobile signal you’re using at the time.
Another really nice touch, and something I didn’t expect to see in a mobile app like this, is the ability to create a new site from inside the app. Hit “New site”, fill out the boxes, and you’ve got yourself a new home for some new stuff in seconds. Neat stuff.
The app also has pull-down-to-update, which is one of my favorite features in Twitter for iPhone. When looking at your list of sites or at a list of posts from one site, you can drag down and release, forcing the app to ensure it has an up-to-date copy of the list you’re viewing.
Note, this app is different to PicPosterous, which is also an official Posterous app but is dedicated to fast uploading of photos. This new app has a lot more features.