I haven't scene Bourne Supremacy yet (I've only seen two movies at the theatre in over a year). However, I saw the Bourne Identity and then read the book. I think I read Supremacy as well, but it's been a while. Anywho... no has mentioned my gripe. And, maybe it's just a woman thing. But, the thing that was really impressed on me as the difference between the book and the movie is that the chick went from being a highly intelligent, fairly bigwig, accomplished, Canadian woman -- to a hot, dumb, French chick. In the books she's central to helping Bourne. In the movie -- she's just there to be hot and have sex. That ticked me off enough that even though I liked to movie on first viewing, I have a distaste for it now.