Our District requires all teachers to have a website as well. We also must post all of our assignments up on our web page. This works well for students who are absent, this way they can get their assignments.
We are headed in this direction, but do not currently have a requirement to have a teacher website. However, I do use a teacher website and I used google sites to create it. I find it extremely useful for myself, and for my students. It is also a great way for parents to see what is going on in my classroom.