http://www.managementhelp.org/hr_mgmnt/hr_mgmnt.htm

Human resources library with a large number of articles and topics both theoretical and practical in nature.

http://www.hrmguide.co.uk/

Offers a number of theorists who were instrumental in the conception of HRM as a practice and the evolution of these theories.

http://www.12manage.com/i_hr.html

A breakdown of theories concerned with HRM.

http://www.ihrim.org/

International Association for Human Resource Information Management (IHRIM), contains articles and reviews.

http://www.shrm.org/Pages/default.aspx

USA professional HR organization with many other links and resources.

www.cipd.co.uk

Main UK professional body offering extensive resources and networking opportunities.