Winter Wrap Up
It was cute to see Twi looking to do something to help and finding it was what she did best. I mean, the entire episode revolves around trying to fit in, and she tries too hard, and fails. Then, when everypony starts fighting, the proverbial lightbulb shines on her head and she goes on to do what she loves to do. Fit in, at your own style. Fun episode. Also, I think Winter Wrap Up is the best Twilight Sparkle's song, even including season finale.
Dragonshy
I don't know exactly why, but Dragonshy is one of my favourites. It was when I saw Dragonshy when I realized I loved the show. I chose this one, not only because of that, but because Fluttershy reminded me of myself when I was younger. Silent and introverted, but don't rustle my jimmies.
A Friend in Deed
Well. First, and foremost, SMILE. Yeah, I have that song engraved in my brain. I love it. Apart from that, this episode gives the party mare much needed depth. I mean, she always welcomes any new neighbor with the same recital, so she expects the same results. In this episode, Pinkie learns that not everyone is cheered up the same way. And she takes that to her soul. Also, Feltspace. Priceless! Priceless I tells ye!