In years past the advent calendar has been mostly viewable by those not in the UK, but this year seems were out in the cold. God bless you tube...
Editing to add that I will attempt to add each day when available, some from youtube, and some from the bbc site.
Day 1 https://www.youtube.com/watch?v=OCMyVNfokHA&feature=related
Day 2 https://www.youtube.com/watch?v=7pkoYKbr1VM&feature=related
Day 3 https://www.youtube.com/watch?v=mMsP4bFcN2M&feature=related
Day 4 https://www.youtube.com/watch?v=Yfb035WXpXY&feature=related
Day 5 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_05#ignore
Day 6 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_06
Day 7 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_07
Day 8 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_08
Day 9 https://www.youtube.com/watch?v=_JX4a303Na0
Day 10 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_10
Day 11 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_11
Day 12 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_12
Day 13 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_13
Day 14 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_14
Day 15 https://www.youtube.com/watch?v=Q5h8_VkOJAY
Day 16 https://www.youtube.com/watch?v=OR2vOB3lztY
Day 17 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_17 (uk only
)
Day 18 https://www.youtube.com/watch?v=gy7vjG39ciM
Day 19 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_19
Day 20 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_20
Day 21 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_21
Day 22 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_22
Day 23 http://www.bbc.co.uk/doctorwho/s4/misc/advent08/december_23
Day 24 https://www.youtube.com/watch?v=CWNku98eGrU
Day 25 https://www.youtube.com/watch?v=FSoqVfm0TP4