Man, what a great episode. I love heist stuff and this was pretty intense. The very end was jaw dropping too, especially since I totally forgot about that kid.
Dunno if it's been discussed before, but my brother brought up the theory that...
Walt is going to kill Skylar with the ricin to keep the kids around. He's definitely crazy enough at this point. Notice how much she's smoking?
...and I totally thought "Oh shit! You're right!". Sometimes it feels like I've been spoiled even though it hasn't happened. Same shit happened to me with Harry Potter, back when the last book had yet to come out, so I hope that it isn't the case even though that'd be one hell of a development.