For those of you who "have to wait until Christmas to get Tiger," you can get a little taste of what you're missing by running Software Update right now and downloading Quicktime 7. Or grab it directly from Apple's website. Quicktime 7 Pro keys are $29.99 and as you'd expect, previous Quicktime Pro keys will not work to upgrade Quicktime 7. Windows users need to stick with QuickTime 6 Pro. QuickTime 7 Pro for Windows is coming soon.
QT 7 has H.264 video compression, amazing responsive live player resize, up to 24-channels of sound and all new playback controls. Requirements: Mac OS X 10.3.9 or later.
Just in case you hate QT 7 or it does something strange to your Mac, you can revert to Quicktime 6.52 by using the Quicktime 6.5.2 reinstaller that Apple has thoughtfully provided.
"The QuickTime 6.5.2 reinstaller will remove QuickTime 7 from a Mac OS X 10.3.9 system and restore QuickTime 6.5.2. Note: This reinstaller will only run on Mac OS X 10.3.9. "
[Thanks for being up so early, Rob!]