>Nonetheless, I still find it annoying, because I just downloaded QuickTime 6.1 about a week ago on a dial-up line, and I'm already obsolete

(elfin buddy)
Welcome to my world.
If you dial-up users are reading this and haven't already downloaded from the Software Update control panel, you can save the 20MB update on your computer so you don't have to download it for each computer [shivers].
In your control panel, check the Quicktime update. Then select, in the menu items, Update > Download Checked Items To Desktop. When the download is complete, a package called QuicktimeSU will be on your desktop.
--Haxie following below: Saving the physical Quicktime file being downloaded from the Software Update Control Panel--
If you want to get real techie about it (especially if you don't have Stuffit Deluxe or DropStuff), check out your Hard Drive folder in Library > Caches > Software Update > com.apple.SoftwareUpdate and investigate one of the akamai.net folders, in which the last directory will show your currently active download.
The tricky part is to save the file just as the download is complete. To do this, keep your Software Update panel progress bar visible, as well as the window with your Quicktime file. (To confirm that you are checking the correct file, get info on it and check the modification date. It should be about the same as the current set date for your computer.) Once you have done this and your window is set for the visible file, have your hands ready to press the option key and the mouse. As soon as the pulsing progress bar becomes smooth and the download is complete, hit the option key and drag the Quicktime file to your desktop. Do this because once Software Update finishes the download the Quicktime file in the Software Update Cache will be removed.
Now check to see if the tar file you just copied works. Double-click on it. As long as you can get to the installer you did this successfully.
You could also just stuff the QuicktimeSU package.
