Coming from the Windows environment there are several design decisions that strike me at best as odd. I use a mac daily now so the comments below should be considered constructive criticism. The system wide menu bar. Having a system wide menu bar means that when working on two or more monitors at once becomes very confusing. For example if you have application A running on display 1 and application B running on display 2 it makes no sense that you have to move the mouse pointer to another display to access its menu bar. Cancelling system preference changes If you open system preferences and start making changes to settings you cannot cancel them. If you exit the dialog, via the red close button, the changes you made are applied which can hardly be considered a good design choice. Disabling the startup sound This has been commented on before but there is no official way of turning off the startup sound on the mac. If you want to have a "silent startup" you'll have to either remember to hold down the mute button on the keyboard while starting up or mute the whole computer. Comments?