I thought this was particularly effective because of the way the Sam/Ruby scene echoed the Sam/Madison scene in S2 ;)
Yeah, I was pretty aware of that too. It's like sex is always this guilty moment of passion with Sam. Not that I'm complaining any. O_O *grin*

I just loved the whole ep. I knew eventually they'd give us some more insight into what happened and this was a really effective way to do it. :)

I do like Castiel. I totally buy him as an angel... somewhat alien to the body he's inhabiting. I think it's something in the way he moves and the very specific facial expressions. He's not the draw card for me though, just an added bonus! :)