Audio

Audio Engineering Society - The leading professional association worldwide for professionals involved in the audio industry. Extensive and well maintained site, including online member services, publication sales, and full information about events including AES Conferences and Conventions.
www.aes.org/

Institute of Broadcast Sound - UK based organization for those professionally engaged in sound for broadcast TV and radio.
www.ibs.org.uk/

Society of Professional Audio Recording Services - Non-profit trade organization serving the needs of the audio recording industry. History, news, membership information, industry links.
www.spars.com/