I just plunged back into learning Chinese with renewed fervor (I had been slacking, 太忙), and discovered this little gem to supplement my Popup studies with.

http://www.slow-chinese.com/

This is brilliant. I love the Popup Chinese approach of a small singularly crafted dialogue, followed by thorough digestion, but this seems to cover the other side of the coin. When I need to keep my ears inundated with Mandarin, I can put these on.