5dot1.com
Promotes the use of surround sound and multi-channel audio systems. Sites includes information on how to listen to and record for 5.1 surround sound, articles of Dolby Digital, DTS and using AC-3 on CD-R discs.
http://www.5dot1.com/

Audio Ideas Guide
Hi-fi and Home Theater e-zines. Reviews, news, articles, tweaks, and other audiophile resources.
http://www.audio-ideas.com/

Audio Review
Offers consumer-generated product reviews, ratings, prices for brands and models.
http://www.audioreview.com/

Audioed Resources Site
Offers educational resources for the International sound recording community.
http://www.audioed.com.au/

AudioKarma
Focused to stereo high-fidelity, including tube audio, home theater, and especially vintage 1970s gear, even vintage TV receivers. Site offers discussion forums, help, and general information for the audio enthusiast.
http://www.audiokarma.org/

AudioNova
Audio resource for manufacturers, forums, magazines and journals.
http://www.audionova.nu/

AudioWorld
Audio industry, news, reviews, ratings, references, company directory, and cross reference.
http://www.audioworld.com/

Celtic Variety Online Radio
Celtic variety online music radio has the biggest variety of celtic, new age, and world folk music on the web! Celtic variety radio is broadcasted live 24 hours a day, 7 days a week. It is free to listen anywhere where there is an internet connection
http://www.celticvarietyradio.com/

HeadRoom
Offers reviews and evaluations of headphone equipment. Includes a buyers guide.
http://headroom.headphone.com/layout.php

Home Theater Discussion Forum
Database of home theater information, set-up hints and buyers guides.
http://www.smr-archive.com/

Los Angeles Audio File
Home theater and audio community with product reviews.
http://www.laaudiofile.com/

Remote Central
Information on mid- to high-end universal remote controls: product reviews; message forums.
http://www.remotecentral.com/

Retro hi-fi
A vintage high-fidelity portal for discussing and displaying classic and vintage amplifiers, tuners, turntables such as Thorens, Quad, and pick-up arms. Also, provides a classified listings.
http://www.retrohifi.co.uk/

Sonic State
The music and pro-audio theme park. Features classifieds, synth site, directory, and chat.
http://www.sonicstate.com/

The Audioholics
Includes information, reviews and technical guides for equipment and accessories.
http://www.audioholics.com/

Tuner Information Center
Focused on vintage stereo tuners. Reviews of tuners, explanations of how tuners work, explains about tube tuners, and notes alleged fraudulent online auctions.
http://www.fmtunerinfo.com/

Useful Audio Potpourri, A
Focuses on indoor FM antenna design and a Hafler circuit for surround sound. Also, includes a directory of related links.
http://members.tripod.com/martin_leese/Audio/

Wired 4 Music
Resource of information on Super Audio CD, DVD-A, DSD, Surround. Practical tips on hi-res recording and 5.1 surround.
http://www.wired4music.com/