hmmm, whenever i tried buying ebooks from Barnes & Noble, it repeatedly said "delivered only to US addresses", which is ridiculous considering... everything. to add to what ProfCrash said, i was more than a little miffed to discover that this policy does not apply only to books that are restricted across the board. many unrestricted books i've bought on amazon were not available on B&N (as in they were restricted)
but i'm not going to re-re-re-re-re-re-re-reopen that can of worms.
just wanted to point out that depending on where you are from the nook might be facing just as many restrictions (if not more) as the Kindle. for me that was the decider from the get-go. that and the awesome price of the kindle.
whichever you choose i hope you get the one you love!