It never falls back on 'laziness' or slang, and includes very few Americanisms ('she left her cell phone' being a notable example) I think its amazing the way that you can sense the physical and emotional feelings from Bond and other characters.
Its got much to do with the way that it was acted, but its always interesting.
The dialogue is brilliant, witty, and intelligent. Vesper is also a perfectly written character in the film as well, who's modestly sexy (I hope that is an understandable contradiction) and simply beautiful. The way that the car chase really reflects the 'black hare and greyhound' nature of the writing of the chase in the book, albeit the film version seems much shorter. The fact that Bond is having caviar and toast in the restaurant across the way from the casino after winning. I love the detail and attention it pays to the novel.