Posterous is the second such quick blogging service to pop up in the last year or so. Like Tumblr, it has a clean—if plain by comparison—design, is easy to set up, and easy to use. In fact, all that's needed to get started on Posterous is an e-mail—just send one to post@posterous.com, and the service will automatically generate a Posterous blog for you. However, Posterous' reliance on e-mail as a posting tool is both an asset and a liability.