I’ve been a big fan of pighixxx infograph work since he released his ABC (Arduino Basic Connections) cards a few years back. His original Raspberry Pi pin-out sheet found a permanent home in the Pi notes folder, now he’s updated it for the Pi B+ and Pi 2. You can find it here:
http://www.pighixxx.com/test/2015/06/raspberry-pi-v2-mod-b-pinout/