Listened to a great podcast on web page hierarchy, that gives insight into how to use hierarchy on a web page to increase usability, prioritise content, and to ultimately help attain whatever goals you've set for your website. He also presents a number of case studies, slides of which you will find in his presentation pdf. So much good stuff here, like how users actually read a webpage (we don't - we just scan), and what tools to use to create hierarchy (contrast).
Importantly, this highlights the need for clear goals and identification of website priorities - you have to know this before you can create useful web page hierarchies.
Get the podcast here.
Get the pdf of his slides here.