SPOILERS (3/17/13)
Great episode. The opening scene with Andrea/Mishonne puzzled me at first, til I realized it was a flashback. Glad to see Andrea siding with Rick but The Governors assistant (the geeky guy) sure gave up Andrea easily. Geez, don't trust that guy with a secret.

Was it him that started the fire?
Exciting cat & mouse scene between Andrea & Governor in the warehouse or wherever they were. But damn, just as I thought Andrea was home free.....BAM!!

Rick looked like he thought he saw something at first, as he was standing guard at the prison. Talking Dead indicated (and likely so) that he maybe thought he was seeing his visions again and disregarded whatever it was he thought he saw.
Anyway, I think it was one of the superior episodes last night. Very good right down to the ending. Didn't you just know as the camera moved in the dark that it was definitely leading to "something?" Love it!!
TIS
Oh, and good move on Andrea's part for leading The Governor to the door with all the walkers behind it.