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If you're juggling multiple authors who haven't been acclimated to the publishing process through WordPress, this is a great way to get them writing posts. Sometimes, your writers will want to use Microsoft Word as a means to publishing posts, but they'll usually forget to strip the formatting before pasting the content into WordPress, resulting in different fonts, sizes, and other quirks. Moreover, if they are doing this, they're unnecessarily doubling their workload too. By allowing your content producers to use e-mail as a means of publishing content, there is virtually no learning curve on how to put something online, it's something your site authors have done plenty of times.
As noted earlier, WordPress does provide native functionality to post through e-mail. This process is counter-intuitive, as you need to know your mail server (and whether it's encrypted), port number, deal with some iframe code snippet, or a custom PHP function. In the time it takes you to figure this out, you'll have already published your first post, probably through a cell phone. Posterous, on the other hand, has simplified and polished the entire process, with the help of its 15 million monthly users, making it a seamless effort to publish through e-mail.