Disable OS X Startup sound
Especially when you’re in public spaces or at home, late into the night and do not want to disturb people around you with a stupid chirpy chime sound - the “startup sound preference pane” comes very handy, since there is no option in OS X (at least in tiger and leopard) to turn off the startup sound.
Hearing the windows xp / vista startup sound is also annoying but at least there is a way to turn them off in the GUI in windows. Lots of people do not do that of course. Now that I am sitting in the drupalcon conference in Szeged, Hungary I see that most geeks use Apple laptops (macbook and macbook pro 15″ are the most used). However if you forget to turn down or mute completely the system volume when you switch it on, lots of people will be distracted around you. You do not want anyone to be aware of you in most cases, especially when you are just turning on your laptop. Who the hell (should) care(s)? So be kind and grab and install the below system preference pane, and use the ‘mute’ option in it. Pleeeeeeeease…!
http://www5e.biglobe.ne.jp/~arcana/software.en.html
Screenshots:


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