Lesson about two great directories of websites organized by topics.
AllMyFavs.com is very eye-catching, with all the website icons. It has lots and lots of categories of websites. Really seems to have anything you want right on the home page. As it's logo says, "Why Search?"
43marks.com is much more low-key. Text only and not as many categories as AllMyFavs.com. But does have nice searching, where you can toggle between Google & Yahoo search results.