found on Mac OS X Hints…
In the midst of playing around with the newly discovered Software Update log file (see the recent hint), I also found out how to remove those annoying notices that pop-up when you try to quit Software Update without installing all the updates. In my case, it’s the AirPort update on my desktop G4. It shows up every time, and when I quit the updater application, I get a warning dialog about “are you sure you want to do this even though you haven’t installed this update?”
Like a few others published this week, this tip is probably blatantly obvious to many people, but I’d never previously looked at the menubar in Software Update. If I had, I would have seen the Update -> Make Inactive option. If you simply highlight the package you’d like to ignore and then select this menu item, you’ll get a dialog box warning you that you won’t be able to update this package while its inactive. Click on Make Inactive and that’s the end of the warnings when you quit Software Update.
If you ever wish to update the inactive package, select Update -> Show Inactive Updates and then reactivate the package(s) you are wish to update.
Again, my apologies if this was obvious to everyone but me, but I had no idea you could ignore updates!