I agree, getting a professional ISF calibration is really the way to go....but the Avia and Digital Video Essential discs can give you about 75% of a ISF calibration. Calibrating your set costs about $250-$500 (depending upon who it is and what you want them to do) and makes EVERY difference in viewing your set. I had my lil 27" Sony XBR done and it was a night and day difference -- I would do it all over again if I had to.
Juan, I don't know what kind of TV you have, but if you watch a lot of TV and want your TV to look its best, look into having it professionally calibrated. We can give you lots of info on the process