Acoustic guitar.com 
Huge site with lessons, forums, reviews, features, and viewable back issues of their magazine.
Acoustic-Guitars.net
Acoustic guitar buying techniques with advice on wood, and care of the instrument, creating an easy atmosphere for buying an acoustic guitar.
AcousticGuitar Workshop
Downloadable course to learn authentic acoustic blues guitar techniques online from Rick Payne, UK blues guitarist.
Bedroom Acoustic Music
Retailer of acoustic musical instruments including classical and steel-strung guitars, banjos, mandolins, bouzoukis, whistles, recorders and other folk instruments.
Dasmn acoustic guitar
Extensive and free online acoustic guitar tuition. Industry links and song tablatures.
Guitar Man Acoustic Guitar Tips
Guitar tricks, and tips on care and preservation, playing, and tuning. Includes photos and sound files of various acoustic guitarists.
Guitar Tablature for acoustic guitar
Guitar Tablature for acoustic, bluegrass,swing,flatpicking,acoutic rock.
The Unofficial Martin Guitar Forum
Site for Martin guitar enthusiast to talk about their Martin instruments.
