Although not really a technical tip, for departments that have their own servers, please do not advertise the server software you are using. Keep your audience in mind. One of the great things about using the web is the large numbers of people you can reach. This is especially important to keep in mind when the information you proffer is for student consumption.
Students are normally short on money and have to do their browsing on a budget.
Please do not leave them out. Keep your pages narrow. Many people still have computer screens limited to less than 500 pixels across. Consider making multiple pages. One flavor for users with the latest and greatest equipment and software as well as optional pages for those with less capable graphical or even text based browsers.