try to move one of these apps to the trash to uninstall it and you'll get a message saying: '"Safari.app" can't be modified or deleted because it's required by Mac OS X.'
Well I usually like to make mistakes on my own and not to be driven that much so here is a way to delete any of these default apps that are "required" by Mac OS X, for apps like Stickies, Chess, FaceTime, and Photo Booth, you can delete them without any bad effects while for something like Safari I'd rather advise to know before which software is using their components... anyway do it at your own risk because there is no undo to the app deletion but reinstalling the individual application or Mac OS X.
- From a Terminal type the following
sudo rm -rf Safari.app/
sudo rm -rf Mail.app/
sudo rm -rf FaceTime.app/
Delete QuickTime Player
sudo rm -rf QuickTime\ Player.app/
sudo rm -rf Stickies.app/
sudo rm -rf Chess.app/
sudo rm -rf iPhoto