Much clones are made in the USA (Sparkfun and suchlike)
As far as I know, Sparkfun (and also the NKC Freeduino) has at least their PCBs manufactured in China, while the official Arduinos make a pretty big deal about the whole thing being manufactured in Italy.
Which is not at all the same thing as claiming/implying that official production of the Duemilanove has been moved to (my factory in) China and that's where you should be buying them from if you want that version...