The Media and Communication Studies Site:
The MCS (pronounced 'mix') site is a British-based gateway to Web resources useful in the academic study of media and communication. Excellent stuff..
Communication studies, cultural studies, media studies infobase by Mick Underwood
www.theory.org.uk -- the media theory site
A site about forecasting the future of media.
The Media History Project:
Resources on the history of media and communication.
PopCultures.com | Theorists and Critics