I use a class web site, www.physicsmedic.org, and blogs with my classes to give them resources and to keep things organized. I use Google Sites and Google Blogger.
The main site is mainly static, containing my schedule, a links section, file downloads of class files and resources, and useful information for the students, as well as sections for new teachers and some educational technology resources.
I use blogs, with this as a start page http://mrandradesclasses.blogspot.com/, as a weekly or daily guide to what we are doing in class. I can post assignments, links to web sites, and reminders about tests and upcoming due dates to the blogs. I have my students subscribe to the blogs via email so that they get updates whenever I add something to the blog.
The students love having these resources available to them and it makes my life much easier and much more organized.
How do you use the internet in your classroom?