1) The Invasion of Time by David Agnew (pseudonym for Graham Williams and Anthony Read)
2) The Monster of Peladon by Brian Hayles
3) Partners in Crime by Russell T. Davies
4) The Ark by Paul Erickson and Lesley Scott
5) Smile by Frank Cottrell-Boyce
6) The Doctor, the Widow and the Wardrobe by Steven Moffat
This was a tough one! I really enjoyed Smile but there are a lot of good stories here!