Hi José,
I think you (and others especially into jazz & standards) may find the following website links both valuable and useful. I certainly have:
Leadsheet Charts Vanilla Book of Chord Changes Jazz Piano Transcriptions Jazz Lounge, includes Transcription Charts Jazz Chord Charts: The RealBook The Jazz Improvisation Primer A great big thanks to Washington DC renowned jazz pianist & fellow SZ member 'raymb1' (Ray Mabalot) for initially telling me about these great sites.
Scott

[This message has been edited by Scottyee (edited 08-11-2005).]