Ah, sorry, I was stupid and didn't scroll down to see that this is closed already... ^^; Woopsie.
Well, since I'm posting anyway, I'm gonna just say I gave a vote to Shirobako. Opens the anime industry's insides nicely and still manages to be interesting and amusing most episodes. I think it's a very well executed anime. Nothing much dark about, though, if that's what you're after... just the struggles of a small animation studio in this day and age. ;D