Here's my ranking for Series 2, including the Christmas Special. Not including minisodes.
1) Episode 4: The Girl in the Fireplace
2) Episode 13: Doomsday
3) Episode 12: Army of Ghosts
4) Episode 3: School Reunion
5) Episode 9: The Satan Pit
6) Episode 8: The Impossible Planet
7) Episode 6: The Age of Steel
8) Episode 5: Rise of the Cybermen
9) Episode 11: Fear Her
10) Episode 2: Tooth and Claw
11) Special: The Christmas Invasion
12) Episode 12: New Earth
13) Episode 7: The Idiot's Lantern
14) Episode 10: Love & Monsters