Yesterday's news. Find yourself an iBook from 2001 and take a look at the USB ports. The setup they're using now for USB has been around for almost a decade now. From iBooks, 12" Powerbooks, and MacBooks to todays unibody systems the placement of the USB ports on one side hasn't changed.
My non-unibody MacBook Pro has one USB port on each side. (Personally I much prefer that layout to having them both right next to each other)