The Yahoo Directory has many categories, from Arts and Humanities to Society and Culture (and everything in between). You can drill down via either the Search or Advanced Directory Search links, and you can also get new additions to any category delivered to you via RSS - check it out at the Yahoo Directory RSS Feeds page.
Also, if you have a web site that you'd like to submit to the Yahoo Directory, you can read my article titled 8 Ways to Submit Your Site to Yahoo for more detailed information. The Yahoo Directory is an excellent place to submit your site to be spidered by search engines; however, you should expect a "reasonable delay" when going through the site submission process.
Overall, I find the Yahoo Directory an incredible place to find new and interesting sites; I enjoy browsing around the categories and sub-categories.
