If you visit the Apple’s online store you’ll find there are two different kinds of buttons used to make a purchase. Light colored buttons for purchasing stuff that’s old and boring, and dark colored buttons for purchasing stuff that’s new and exciting.
OK, it’s not quite like that. Some new products, such as the new iPod Nano, get light buttons while some not-quite-so-shiny products (e.g. the black iPod Classic) get a spiffy dark button. But, if you look at Macs, it’s very consistent. The plastic MacBook, MacBook Air, 17″ MacBook Pro, Mac Mini, and Mac Pro have light buttons, while iMacs and new MacBooks have dark buttons. (The new 24″ display is an “accessory” and thus gets a green button.)
I choose to take this as an endorsement of Barack Obama.