To celebrate the launch of the Pi Zero, and more recently Raspberry Pi 3, Pinout has been updated to be cleaner, more comprehensive and more accurate and will continue to be improved. New boards visual and selection filters are also available to help you find what you need more easily.
Pinout was originally designed for the old 26-pin Raspberry Pi models, you'll see the outline of this original header displayed on the left in a slightly darker shade. If you click a pin you'll see details of its BCM pin assignment on the original Rev 1 Pi.