I did spot some Asterix comics on the graphic novels shelf in the bookstore recently, but they were kinda hidden in there. And a few pages from one Asterix story were used in the textbook for my French history course last fall. But...yeah, for the most part, international comics, with the exception of manga and anime, of course, don't really catch on in the U.S.
Well, Tin Tin must be kinda popular for American directors to consider it. Not to mention aforementioned PBS special, and an episode of Arthur where they mentioned/paordied it.
But then again we got the cartoon version of Archilles Talon (rechristended Walter Melon), and not the comics.
But that doesn't stop us from getting crappy French animated series like Martin Mystery (which was a disgrace to a pretty good obscure Italian comic) or anything like that. Just wish they'd redub or subtitle the movies.