This is quite possibly my favorite episode. I love the Costanza's anyway. But when George is halucinating about the doll nagging him - that has to be my all-time favorite Seinfeld moment. It gets funnier every time I see it.
I have to admit, too, maybe too many people won't agree, but I have a thing for Kathy Griffin, and she's in this one quite a bit.
Pound for pound, the best episode in my opinion. Seinfeld was one of those rare TV shows that actually got better as the years went by. I guess you could say the characters developed. Season 7 is one that I absolutely cannot wait to buy on DVD.