Andy Wibbels has a great post that list out the Anatomy and Structure of a TypePad, WordPress, Blogger and Movable Type Blog. He created four diagrams to show the structure of four of the most popular blog platforms. It’s a good lesson for newcomers to blogging.
You can quickly see that while Blogger is free and Google-powered, it lacks some great features like categories and integrated search. WordPress and Movable type have the most options since they are installed on your web server – Blogger and TypePad are hosted for you.