Economics Ph.D. Programs - An extensive list of economics departments with Ph.D. programs in American and Canadian universities.
Economics Grad School - A guide to grad school in economics with admission stats, rankings, etc.
Economists with Web Pages - List of home pages of economists and some economics departments.
MBA Explorer - The Graduate Management Admission Council maintains this page of information about MBA programs including an extensive list of business schools on the web.
Law Schools and Libraries - The Virtual World Wide Web Library's list of law schools and libraries on the web.