What - And Who - Is Next For New Who?

With news of David Tennant's resignation as Doctor Who » 11/04/08 1:20pm 11/04/08 1:20pm's eponymous timelord still making grown fans weep, the aftermath is beginning to be felt around the internet: Who are the frontrunners for the role of replacement? What made Tennant almost change his mind? And what storyline has possibly been killed as a result of …