Yes, that sound does inspire warm feelings in all of us, but there are times when you'd rather not hear it. For instance, on my MacPro, the chime always plays on the computer's inbuilt speaker rather than the ones I have connected. It just doesn't sound good on that poor quality one. Also, on the MacBook Pro, if you're booting up in a meeting or library or other public place, the chime isn't something you want going off and disrupting people. Enter this little freeware app I found.
Simply install it and an icon shows up in your System Preferences allowing you to change the volume of or simply mute altogether the startup chime of your Mac.