As posted on the "other" thread (link provided by
Fordim in first post), there are two changes to the books which I actually approve of (what's that, like 0.000001%?).
Boromir was a thoroughly more likeable character in the movies than the book. This makes "filmic" sense to me in that it makes his descent to ring-hungry bully at the end of FOTR is all the more tragic.
Secondly, PJ changing (or making obscure) the exact nature of pipeweed. It's "the finest weed in the South Farthing" and Gandalf's "love of the halfling's leaf" slows his mind in Saruman's estimation. It's a very humorous change, in my opinion, and a welcome one, although it begs to ask the question "would the Professor have approved"? No, quite probably!
BTW, let me know if I'm coming completely out of left field with the weed comment. IMHO the movie certainly seemed to allude to illicit substances. Lawks, I hope this kind of talk doesn't get me banned!! Well, it was nice knowing you all...