This site is one of those treasures that has so much to offer, I can’t put a full description in my limited space. Please check it out for yourself.
From the author, Joe Landsberger:
For the past seventeen years I have researched, authored, maintained and supported the Study Guides Web site as an independent educational public service. We have enjoyed collaborative projects across institutional, cultural and national boundaries. I resist registration and distracting graphics or features that may interfere with maximizing learner access and success. I hope you find the resource helpful.
Here is the current table of contents for the site: