Photoshop: Apple Style Buttons

[icfireball]

How do you create Apple style icons/buttons/etc like these in photoshop:

http://images.apple.com/ilife/images/bottombuynow20060111.jpg
http://images.apple.com/aperture/images/mainordernow20051020.jpg
http://images.apple.com/aperture/images/mainarrowcontentbevelsmall20051020.gif
http://www.adiumx.com/images/MacOSX_Universal_60px.gif
http://images.apple.com/macosx/features/spotlight/images/indextop20050412.jpg http://images.apple.com/macosx/features/finder/images/indextop20050412.jpg

Or do they create them with vector based imageing programs? And if so...why programs would they use to do so and how do u create images like that?

[piot]

Aqua Buttons via Google (http://www.google.com/search?client=safari&rls=en&q=photoshop+aqua+buttons&ie=UTF-8&oe=UTF-8)