Music Software Reviews: Facts Against Hype 
Tests of the top music software on the market, facts and information on recording.
http://www.music-software-reviews.com/Beat Mode
News, articles, and reviews about music technology and software including samplers, synthesizers, and sequencers. Free loops.
http://www.beatmode.com
Music Theory Online
The electronic journal of the Society for Music Theory.
http://www.societymusictheory.org/mto/
Laptop Studio
Links and summaries of reviews from various publications.
http://laptopstudio.thunderguy.com/
