It really depends on the mood of the day. It may be music, podcasts, let's plays (I prefer crews in this regard, co it's kinda like a podcast, coming to think about it); very rarely tv series or shows (in this case it's usually something i've seen for dozen of times, so that I don't need to actually watch it to follow. Actually I can list the only ones that I happen to listen to while working: QI, Top Gear, Mai Dire TV, Red Dwarf. That's all).