tools to help you learn and improve guitar

chords program which shows you exactly how to play every chord
G3C:
http://www.bincsoft.com/?page=g3c

the best collection of english language songs with the chords or tabs:
http://www.ultimate-guitar.com/

the best collection of portuguese language chords (also for 5 other instruments):
http://www.cifras.com.br/

digital guitar tuner program (uses your microphone)
http://www.hitsquad.com/smm/programs/DGT/download/

how to use your guitar as drums: