First off, the regeneration sequence with David Tennant giving up the role to Matt Smith was very good, and it has been posted to YouTube several times. I thought I would share it. The music is just choral in nature, somewhat epic, and is fitting for the Russell T. Davies period (even though I understand the regeneration sequence was written by Steven Moffat).
Second up, I offer up the preview trailer for the 5th series of Doctor Who and the new Doctor, Matt Smith. I know that Space did not air this last night, although it's possible they will air this sometime in the future.
Looks pretty good, doesn't it? :)