I received today (, and am listening to now ) Doctor Who: The Sirens of Time. This is the first in a series of new audio dramas produced by Big Finish Productions, fully licensed from the BBC, and with the original cast. They have kicked out about twenty of them, and I have just got the first.
It's really quite interesting. I'll post a full review when I've heard it all through a couple times.
Check out the site for the new productions!.