I've been using Posterous for a while, and if you are considering blogging as an option to keep your thoughts, ideas, resources, comments, audio and video files in one place, Posterous might be what you're looking for.
Its main advantage is its user-friendliness. It is so simple to start using it that the whole process begins with an email. You send an email to Posterous and your blog is ready to go! Then, you can keep blogging by email. If you attach photos, Posterous creates a slideshow. If you attach an audio file, it automatically embeds a neat player.
However, what I'd really like to highlight is the group feature in Posterous. You can have a group of people blogging into one Posterous blog once the administrator invites the contributors to collaborate. It nicely aggregates all the posts into one place, which makes it very easy for the group to keep track of the updates without understanding much of feed issues (as shown in the image above).
Posterous makes blogging easy, effective and social. Try it and you'll see what I mean.