Audioholics

Provides A/V hardware and software reviews, equipment buying guides, system set-up tips, and user forums.
http://www.audioholics.com/

Guitar Reviews

In-depth reviews on various guitars written by industry professionals.
http://www.proaudioreview.com/par/musician_reviews/index.shtml

DJ Equipment Reviews

Reviews on headphones, mixers, and turntables written by DJs.
http://www.dj-equipment-reviews.com

eCoustics Audio Reviews

Editorial and Consumer reviews on both home and pro audio products.
http://www.ecoustics.com/Home/Home_Audio/

AudioVideo101.com

Music & Audio knowledge-base including music terminology definitions, product reviews, and audio related FAQs.
http://www.audiovideo101.com/

Woodwind.org

Information on woodwind instruments, mailing list, links to wooodwind articles.
http://www.woodwind.org/

Audio Asylum

Searchable knowledge-base for everything audio.
http://www.audioasylum.com