@nollagkind: I don't live in the US, but I didn't have any problems downloading and using Kindle-BB. The only problem I ran into was in the Online Store, where the program told me that I need to be a U.S resident in order to buy books from the device.
That was corrected easily enough by going to Amazon's
"Manage Your Kindle" page, and updating my country (in the Your Country section) to the U.S of A!