On the Shadow Fox Network today, they've posted parts one and two of their look at building a better blogging system.
In part one, they talk about things where all good projects should start - with the planning and what it will take to get the project done. This includes the structure of the application, the usability, and the extensions you'll want to use.
Part two goes a step further into the planning stage by looking specifically at the design and usability of the application. They start with the base HTML and add some styling and images to make it easier to use.