I have found that when I am gone, my students cannot work on the ECS group lessons/projects. Luckily I stumbled upon a great post online listing 10 Essential TED Talks that Aspiring Programmers should watch.
I have had students watch and summarize these, when I cannot be there to guide our class. The TED talks are listed/linked here:
http://devbootcamp.com/2013/02/25/10-must-watch-ted-talks-for-all-aspiring-programmers/