Just watched 28 weeks later and, damn, it's a good movie.
@ chrisname: I was kind of implying that the zombies I refer to were indeed once people (and are not hellish abominations - don't want this to become another (anti-)religion thread, so please refrain from discussing that :P) so it would indeed be a "disease".
If you haven't seen Shaun of the Dead....get off your ass and DO IT NAO. It is by far the best Zombie Movie ever, which is ironic because it's a parody....