Background doesn't interfere with text. Graphics and multimedia have a purpose, add to the instructional value. Site uses thumbnails for large images and tells you how big the images are. Downloadable files are easy to download. If a file is very large, its size is indicated.
Site invites feedback and provides an e-mail address.
The URL is included on each document. You can submit sensitive data securely. Creates good first impression. Design is clean and uncluttered. Presentation is tasteful.