>It seems to me that the Scandinavians (esp. Swedes), besides the
>Dutch acquire the most natural-sounding accent to other non-native
>speakers ears. What do you say?
I would have to agree with this with regards to the Scandinavians. The majority of those whom I had a chance to talk to / listen to had a very minimal "foreign" accent. I suppose the reason for it is the similarity of English and the Scandinavian languages (all having common roots).
I can't comment on the Dutch because I don't recall too many encounters with them, however, I've read/heard that the Dutch seem to be one of the most talented when it comes to learning languages and majority of them can easily communicate in 3-4 of them (Dutch, English, German and French). I guess the similarity in the origin of the languages as well as the country's location plays a big role here.
Now, how about the most unnatural / hard to understand?
My nomination: Indians/Pakistani, Far East Asians.