I have been thirsting for an article like this for quite some time now. To be honest, until I scored a Sony Reader as a Christmas gift, ebooks were not as on-my-radar as they ought to have been. Since December I've been wrestling with DRM and pricing issues, and wondering how the iPad's certain ubiquity will change the model.
This article gives a great perspective on the matter, particularly by spelling out where the publishing money is going. In case you-- like me-- had no clue whatsoever how that money gets allocated, this is a solid primer to use when people start asking why e-books aren't cheaper than they are.