iTunes organization and iPod Auto-Sync!
A great tip submitted by Kev: iTunes organization and iPod Auto-Sync! Instead of checking or unchecking every song one by one in iTunes or in an iTunes playlist, you can hold "Command" and click on one checkbox. It will automatically check or uncheck every song in that playlist. This is particularly useful if you auto-sync your iPod. The auto-sync feature will choose among the songs that are checked. You could either uncheck all the songs with this, create a playlist that you want the auto-sync feature to choose from and check every song in that playlist with the "Command-click". The opposite can also be done where you create a playlist of songs that you don't want on your iPod and uncheck them all with this feature. Thanks for the great tip Kev!