Audio Asylum: Searchable knowledge-base focusing on pro audio DIY, FAQs, and guides.
Audioholics: Provides A/V hardware and software reviews, equipment buying guides, system set-up tips, and user forums.
eCoustics Audio Reviews: Editorial and Consumer reviews on both home and pro audio products.
Gearblasters: Find similar audio products within a price range.
Guitar Reviews: Comprehensive reviews on electric and acoustic guitars written by industry professionals.
Woodwind.org: Information on woodwind instruments, mailing list, links to wooodwind articles.