Web Resource:

ActionTab: Uses an animated fretboard to show how to play various songs without needing to read tab or music score.
Big Road Blues: Home for all things blues.
Greg's Midi Tab: Free backing tracks for guitarists. Includes TAB. With Bands like AC/DC, Clapton, Eagles, Led Zep, Metallica, Motley Crue, Nirvana, Santana, Van Halen and many more artists and styles.
Guitars & All That Jazz: Internet radio station featuring guitar instrumentals, jazz & pop standards. Requires high-speed connection to listen.
Guitarfind.net: When guitar dealers compete you save. Visit Guitarfind.net to learn more.
GuitarGearHeads: A site devoted to the never ending quest to find the perfect tone.
Guitar Directory: Designed to help its users find information about guitar and related companies, products and services.
Guitar Notes: Everything about guitar - mp3, guitar tab, lessons, luthiers, music shops, your favorite guitarists, and much more!
Harmony Central: Resources for guitarists with free classifieds, gear reviews, tablature, guitar magazines, manufacturers, retailers, info on tube amps, electronics, and links to other sites.
jazzguitar.be: A site dedicated to the jazz guitar.
Matt Designs: Affordable Website Design! Great For Bands!
Play Jazz Guitar.com: Everything jazz guitar, home study course, forums, free lessons, books and sheet music.
Popschool Maastricht: Dutch site with lots of information on music theory, instruments, songwriting and interactive tools for eartraining and note reading.
ShanzuGuitars: Offers the latest guitar news, tools and resources to budding guitarists.
Taxi The world's leading artist & repertoire company.
The-X-Perience: For all fans of Phish, Jimi Hendrix, The Grateful Dead and Pink Floyd
Transcription-Resources: Everything to do with transcription and transcribing.
Twelvemonth Music: Innovative music and guitar learning methods based on visualinear tablature, a new music notation system.
101GuitarSites: Top ranked guitar sites and tab resources