I liked the Ood episode. I enjoyed them in the Satan Pit story and I thought they did a good job of explaining them this week. Donna is growing on me, she's smart and makes good observations (like the Ood having to be peaceful because they have their brain in their hands and can't risk fighting) and she also has a good moral center (or I guess "centre" since she's British) which helps push along the Doctor, and he seems like he needs someone to make him care about the little people instead of just fighting the monsters attacking them.

Bow ties are coool.