The iPod is the exception because it started that trend, and Apple has brought everything in line with it.

Quick, which Apple product is this: http://www.photoshopnerds.com/images2/xp_icon_01.jpg

It's an... iPhone. No, an iPod. No, it's a Studio Display or iMac turned to portrait orientation. No, its a widescreen MacBook with the lid closed. No its the front-on view of a Mac Pro... It's an Apple TV from the top down which has been squished in Photoshop... It's an Airport Express base station. Or it's a 4G iPhone. Who knows!