The Electronics Lab blog posted an article about a free online PCB design software called PCBWeb. It's currently in Beta, but it could potentially be useful for students to have access to a free, browser based software for designing PCB's.
In addition, Texas Instruments released their power management guide to assist in choosing components for supplying power. It's quite a read, including lots of information on their products and example circuits.
For those interested in creating custom cables for connecting PCB's, motors, sensors, etc., adafruit posted a video made by Derek Molloy of the School of Electronic Engineering at Dublin City University, Ireland about creating custom cables using crimp pins.