Although Web site directories have been around for quite some time, today most people find things via search instead of browsing directories. There are still plenty of specialized Web site directories out there that carry useful information, including those for hand-picked regional sites or do-it-yourself sites for people who, say, build their own canoes. If your business caters to highly specific demographics, such sites are most certainly worth your time and money.
For more on Web directories, be sure to read Listing Your Business in Online Yellow Pages.