This works better than one letter for the year, because it gives the students more control over what they want posted. This actually has to be monitored, because students are so used to putting their names on their work, and also are proud of it. For each project, I have a project manager whose job it is to be the front line checking for details like that. They take it very seriously, because I explain it to them very gravely. At Orange High, our Governance Committee wrote an Internet policy that governs student use of Internet.
Students sign a copy of the policy, and take a copy home to their parents.
The penalty for breaking the policy is not being able to use a computer at school any more, unless directly assigned to by a particular teacher who will take responsibility for it. We finally gave him an independent study in computers, and he built his own and upgraded it to his heart's content. Each classroom teacher is supposed to be the monitor for the students using the computers during class. In the media center and computer lab, if a classroom teacher is not supervising a student, the student has to sign in to use a particular computer. If there is a problem, the media specialist knows who was on that computer when.