I just watched the season 4 finale last night and all I can say is WOW, what a season! The cast, writing and everything about this show is sheer brilliance. I don't know how I'm going to be able to wait 'til season 5.
Here are video links (part 1 and 2) of Michael C. Hall and John Lithgow discussing season 4 and how much they enjoyed working with each other.
Major SPOILER alert - aka if you haven't watched this season then don't watch the videos!
http://www.youtube.com/watch?v=lOBBL45nb8o
http://www.youtube.com/watch?v=WxyaH...eature=related