Firefly
Lots. And lots of Firefly. I only have 3 episodes left and I'm crying here. I can't exactly choose my favorite episodes so far but Out of Gas, Jaynestown, and Ariel were particular standouts for me.
Goddamnit, this show deserved so much longer. I hope Serenity wraps things up nicely... oh my god, f**k you forever in your special place in hell, FOX.