Carolyn Snyder made compiled a great article about things that are not so obvious for developers & designers
http://www-106.ibm.com/developerworks/usability/library/us-tricks/?article=usr
One of the resource used is a report written by Nielsen Norman Group. I've read “Designing Web Usability” book written by Nielsen, and I must say that I've read it in a few hours without any pause. In my opinion, a must read for any web developer.