Here are some links that we've found useful.
Dan Ebbert's Scripting Resource
Bruce Clay’s Search Engine Relationship Chart
Google's Webmaster Help Section
Internet Search Engine Database
International Color Consortium
MA Innovation & Technology Exchange
Valid HTML - Does Google Care?
30 Days to a more accessible web site
24 Ways to Impress Your Friends
Biggest Mistakes in Web Design 1995-2015
Top 10 Lies Told to Naive Artists and Designers
50 Ways to Become a Better Designer