Here is a selection of useful links and resources...

The Central School of Speech and Drama
Central offer one of the few degree courses in Sound Design.
www.cssd.ac.uk

Sound on Sound
A magazine mainly for recording musicians that gives reviews of new gear, computer tips and articles on many useful subjects.
www.sospubs.co.uk

The Theatre Sound Mailing List and Archives
An email discussion list with most of the leading figures in sound for theatre contributing. Membership is a must for anyone serious about Sound Design.
www.brooklyn.com/theatre-sound/

The Digidesign User's Group
A discussion group for users of Digidesign Products (Protools).
www.digidesign.com

Stage Research
The makers of SFX show playback software.
www.stage-research.com