I have put together an overview of MyUCDavis, which you can download as a Word document here. I cover the basics of MyUCDavis, including how to customize channels, set up a proxy, and upload files and make class announcements through your course webpage. I also provide some instructions for using Gradebook, as well as the links for setting up class mailing lists, discussion boards, and chatrooms.
ET Partners also offer some pedagogical suggestions for using MyUCDavis.