Chord House ...interactive chords and scales for guitar/piano.

ConnectedMusicians.com - anything you want that’s guitar related (theory questions, tips, tricks, etc).

Cyberfret...Learn to play the guitar online, through a variety of free lessons and articles. Guitar lessons use video, audio, flash, MIDI, and tablature.

E-Chords.com - 12000 artists with over 200,000 tabs including chords, tabs, bass and drums. For each guitar chord, you can choose among 12 different key variations. All chords have versions for both guitar and keyboard and each one of them has a complete chords library.

guitar lessons - a few tips and pointers -- in quicktime format -- for playing folk and folk/rock guitar.
Guitar Noise - Offering free guitar lessons, exclusive interviews, tablature, advice on careers, songwriting, and much more. Serving beginners and pros since 1995. Get free tips from our weekly newsletters. Everything is free and there is no need to register for anything

iBreatheMusic.com exists for established and aspiring musicians who want honest, quality instruction and a casual point of contact where they can interact and develop their skills with like minded people.

iPlayMusic Training Center is an innovative and exciting place for beginner guitar players to learn to play and practice their skills. We offer a variety of information from guitar chords and strumming patterns to Chord Transitions & Finger Strength Techniques.
Ultimate-Guitar.Com...guitar tabs + all updates / news / reviews / columns / lessons / band promos / forums / free stuff

WholeNote - The On-Line Guitar Community...not only offers guitar lessons with notation and customizable music playback for all skill levels and styles, it also offers tools to help you build your own lessons. You can also explore links, reviews, news, member homepages, forums, ear training, and more.