Premium features basically. That's how Blogger stayed afloat before it was bought by Google. Posterous got tons of new features since it launched, and it wouldn

Premium features basically. That's how Blogger stayed afloat before it was bought by Google. Posterous got tons of new features since it launched, and it wouldn't be hard for them to hold a few back and create a compelling package. I believe many customers would pay for a solid templating system, for example.