subject-specific search engines

[Luck, Deanne L]

I'm looking for a site that lists, by subject, all of the subject-specific
search engines and large, yahoo-type directories out there (ones like
Internet Library for Librarians, http://www.itcompany.com/inforetriever/ or
WWWomen,  http://www.wwwomen.com/ )

The closest thing I've found is Directory Guide,
http://www.directoryguide.com/ , but it's not very complete.  
Any suggestions are appreciated!
DeAnne Luck
Electronic Resources Librarian
Austin Peay State University
LuckDL at apsu.edu