Mentormob--a new favorite!

In the pen.io post below you might have noticed the extra practice portion of the mathcast was accessed through mentormob.
This is an awesome way to organize articles, videos, images, anything into a single "playlist."  Perfect for the flipped classroom and to organize personal and professional resources.  I'm thinking of creating playlists for links I would normally keep in Delicious.
After creating the pen.io page for the mathcast, it dawned on me that I could also include the screencast and quiz in the mentormob playlist too.  Then students could access everything at mentormob instead of pen.io.
However, I still like the clean look of pen.io.