Writing a style sheet for latex

The name should be an appropriate name for the project which will be created. Minutes in Less Than Hours: Fortunately there is already an excellent package called titlesec which provides an easy way to to customise our header styles. The table of content is available online. What are some good tutorials on writing custom styles classes that clearly explain commands used and some of the features that TeX has to offer in the way of styles? The first point to remember is that LaTeX2e is rather weak at providing documented 'hooks' for customisation in the kernel. Memoir for documents, Beamer for presentations.