Now available for free is a series of video lessons that use SQL Server 2005 Express Edition to teach databases. The whole series starts here and includes over four hours of video-based instruction. There are 8 lessons in all and they start at the very beginning with "What is a database?"
You may find these videos useful for your own professional development or as additional resources for use in class. The last lesson actually walks you though the steps of connecting a database to a web application so there are lots of places that might come in handy. Check them out and let me know what you think!
Oh and if you don't have it installed already you can get SQL Server 2005 Express Edition as a free download here. You will find other samples and some SQL Server 2005 books available at the same site.