Favourite episodes: A Canterlot Wedding was my all time favourite, but Luna Eclipsed was really sweet and endearing. It's About Time sated both my need to watch Twilight Sparkle and my obsession with time travel. Putting Your Hoof Down was hilarious, and probably the first Fluttershy oriented episode that I adored.
Least favourite episodes: Err, I'm seriously having trouble with this one. If I had to, I guess I found The Super Speedy Cider Squeezy 6000 to be a tad boring.