I love the soundtrack to Hannibal too, it's some of Hans Zimmer's best work I think. I'm actually a bit disappointed that all of the movie's score is not on the soundtrack. Moments including the drug bust scene, various scenes throughout Florence, and especially the ominous piano solo during the film's climax would have been very good additions to the soundtrack as well.
I think it would be an excellent idea for them to consider releasing a second edition of the soundtrack, much as Zimmer did with Gladiator, where these extra points in the score are added and perhaps Anthony Hopkins' dialogue is removed. (I don't mind his presence on the soundtrack but I wouldn't mind owning a copy without it)