This article is from the rec.audio.* FAQ, by with numerous contributions by Bob Neidorff others.
Zillions of them. Here are some places to start:
Robert's page pointing to many Audio pages
http://www.unik.no/~robert/hifi/hifi.html
Dan and Steve's Audio-Related page
http://www.qnx.com/~danh/info.html
rec.audio.* FAQ with Search Engine
http://hydra.unik.no/%7Erobert/hifi/faq/
BMG and Columbia CD Music Club Unofficial Lists and FAQ
http://www.eskimo.com/~bloo/cdfaq/toppage.htm/
Ambisonic Surround Sound FAQ
http://members.tripod.com/martin_leese/Ambisonic/
Tube related stuff
http://www.interport.net/~blackie
Speaker Repair FAQ
http://www.paranoia.com/~filipg/HTML/FAQ/BODY/F_Speaker.html
William Nau's Mail Order Equipment FAQ
http://www.ssesco.com/nau/mailorder.htm
Audio Web
http://www.audioweb.com/
 
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