Posterous has a number of little features that I absolutely love. What's great is that they primarily benefit those of you who consume and engage with my content. (For more, see the photos I attached to the end of this post.)
First, on every post you can see how many page views it received. I like how transparent this is. It's something I wish every content site had. Take a look at the upper right part of this page to get a flavor.
Second, with each post I can control where it syndicates. Currently I post to Posterous and Facebook. Then I let Friendfeed scoop up the RSS and push it into Twitter. This reduces duplicates.