There are no Mosquitos which are flown currently. Sadly, the last flying example was lost in a crash at Barton airshow in July 1996, which killed both crew.
Kermit Weeks' Fantasy of Flight owns a Mosquito which used to fly regularly, but which has not taken to the air for around a decade, I believe.
There is one aircraft undergoing restoration on Canada's west coast, with the stated intention of being returned to the air. There are regular updates on progress in The Aeroplane magazine.
Cheers,
Scherf