From the Heritage Foundation, this site provides great access to leading thinkers and Think Tanks along the conservative side of all issues.

From their website:
"Policy Experts is your single-source directory for locating knowledgeable authorities and leading policy institutes actively involved in a broad range of public policy issues, both domestic and foreign. Journalists, researchers, public officials and conference planners find it to be an indispensable guide for locating the right expert at a moment's notice."