Not one, but two sweet and funny short films featuring David Tennant! You have to watch a short commercial before each one, but I think it's worth it.
Good Night Sweet Heart(2001)
http://www.indiemoviesonline.com/watch-movies/sweetnightgoodheartTraffic Warden (2004)
http://www.indiemoviesonline.com/watch-movies/traffic-warden