I have just started to explore posterous - which describes itself as "the dead simple way to put anything online using email" and says "We're super excited to see what happens when blogging becomes as easy as email, and we hope you enjoy posterous as much as we do. Thanks for trying it."
Posterous can be used in lots of ways. For myself, I simply hope to use it as a kind of in-between point - somewhere between blogging and sending personal emails.
You can see what I mean by checking my first three posts there. They are, in reverse order: