Accessories

Web Strings. Good strings, excellent price, prompt delivery.

Articles

Getting Ready to Perform and Working the Room by Kristina Olson are two fine articles on the art of performance.
Solo Performer. Numerous articles on improving your stage skills.
Jam Etiquette. How to make the most of a jam session.

Publications

Acoustic Guitar Magazine
Poets.org from the Academy of American Poets.

Reference

Chordfind. A nifty interactive tool that enables one to select a chord name and have its fingering appear on a fretboard.
Chordie. Guitar tabs, chords, and lyrics. Some listings enable one to change keys and produce chords for different stringed instruments.
All Music Guide. An extensive recorded music database.

Workshops

Stage Presence