Shadow is one of my favs from season 1. She was good in it because she was starting show what she really was. Plus I laughed at Sam being called a "Pervert".
And Dean's great quote
"Hey, Sam, don't take this the wrong way, but your girlfriend is a bitch."
Scarecrow was my second choice.

Shadow and Scarecrow too

Simply cause Sam was, yet again, molested by something supernatural :D

i loved all these episodes.....mostly because i really did like meg:).....if we want 2 get technical my favorite episode with meg in it would be born under a bad sign :)...but with meg played by Nicki Aycox then it would be devils trap

My favourite ep with Meg! She's so vile in this one, killing Jim Murphy and then Caleb. I love the cat and mouse game between her and John at the warehouse. "Holy water, John? Real cute." :))

All of them are really great. I'm with fifthbitten in that my favorite with Meg is Born Under A Bad Sign.

And salvation (:

Devils trap was a fantastic episode!

i liked shadow,salvation and devil's trap best :) i thought she was the best one of the best demons so far