As educators, our classroom websites need to be usable. In fact, their can profoundly impact learning and readers of MyWeb4Ed know that improving learning outcomes is the goal of our websites used as instructional tools.
Check out http://www.usability.gov/where you will find tips for creating useful and usable web sites! Of of my favorites is "Writing for the Web" at http://www.usability.gov/methods/design_site/writing4web.html. Good Stuff!