This book is not large enough for a discussion of every general search engine on the Web—there are literally hundreds of them. But I do want to take one more section and discuss some search engines that don't need their own chapters but are worthy of discussion.
Open Directory Project—http://www.dmoz.org
The Open Directory Project, also known as the ODP, is a searchable subject index of over four million sites. Like Yahoo, it's a searchable subject index. Unlike Yahoo, it contains no other properties—no news search, no mailing lists, no nothin'. Furthermore, it's a volunteer effort, maintained by an army of over 60,000 editors managing over half a million categories.
It's an amazing effort, and for the most part it's a very good ...