I've never heard of the guy before, but then I didn't really know any of the previous ones before they were Doctor Who either.
Still, at 26 years of age, Matt Smith is definitely going to be the youngest doctor.
I wonder if he'll be able to make all the fans 'forget' about Tennant.
Here's a link to the official site.
Edited, Jan 4th 2009 1:05pm by Zieveraar