I want to post this to those people who have Quicktime 6 and are planing to upgrade to 7 because of the H.264 codec. Do not do it unless you have a G5. I have been converting a few clips to the new H.264 format and they never play smoothly on my 1Ghz 12" Powerbook. I mean, if they do not play well in my system they won't do it in any sistem below and for sure above mine UNLESS you have a G5. The H.264 is a bit lighter than Sorenson 3 (about 10% in MB weight) and the video quality some 15%. I mean it looks good but save your money for now if you are not really in to web video because all the PCs and Macs would have to update the Quicktime player and... their hardware in orther to be able to run the video at a good rate. If I knew before I wouldn't purchase the QT Pro yet> probably that is thereason I do not get the lates software as quick because I know there is always some sort of scam or "lemon" under the hud.