McKay and Mrs. Miller - It was so perfekt to see David and his sister playing Rogney and his Sister. They do not even look similar, they play so as well. This was too much for my risible muscles :D And then "Meredith". This was the top, no way to make it more crazy and funny! The very best episode of season 3.
Sunday - On second place there is the sadest and most emotional episode of the season (and of the series). The scene when the bomb explodes is quite hard but it is a good decision to let a popular character die. The obsequy (Trauerfeier, Beo gab das so raus) was fine too. And of course to see what you can do an Atlantis in your freetime (golfing, fishing, play chess :sleep: :D)
Common Ground - Just because its the only Shep-episode and I am certainly a Sheppard-Fan, so this is my place 3. But it's a quite good story too, so it can't be all wrong :D