EduStyle
http://www.edustyle.net/

EduStyle lets users rate and comment on higher education websites.  They also hold the annual HighEdWeb conference.  Besides galleries of website designs, they have resources, publications, and many useful blog posts.

Drupal Theming Guide
http://drupal.org/theme-guide

The official source of information for Drupal theming.  Includes theming guides for Drupal 5, 6, and 7, as well as Video how-tos, resources, and much more.

TPG Color Contrast Analyzer
http://www.paciellogroup.com/resources/contrast-analyser.html

Text must have a high contrast with its background color for people to comfortably read it.  This is one of many tools that allows you to test color combinations and see if there is sufficient contrast between the two colors.