In the UK it starts on the 3rd of April with the eleventh doctor
Saturday 3rd April 6:20pm BBC1 (UK)
6:45 pm on BBC1.
bbc1!
BBC1
As always, BBC1
The Christmas special is on BBC1 at 6pm.
The Next series of Doctor Who will be shown in 2010. Most likely starting on BBC1 in the spring, although this is not confirmed. For now we have to make do with the 2009 specials.
Saturday September 19th.
The End of Time Part One; BBC1 Christmas Day 6:00pm. The End of Time Part Two; BBC1 New Year's Day 6:40pm.
The first of the 2009 specials will air on BBC1 on Easter Sunday (12th April).
BBC1 & BBC America. As of June 2015, Disney XD (only in America as far as I know) has started airing Doctor Who as well.
There will be no Doctor Who series in 2009, instead there will be four specials, the first of which will air on BBC1 on Easter Sunday. There will however be a new series in 2010.