http://freemaagyeman.com/news/2007/0...view/#more-128
Theres 2 videos on that website. The first is from Freema Ageyman, and the second is David Tennant and the Series 3 preview that was shown at the end of Series 2. Not overly spoiler-ish, if you dont look at the preview, but still pretty good.
They're only about 2 mins each
Freema looks really enthusiastic, doesn't she?