Sawasdee Krub K Bthoven,
I'm also Thai living in BKK. I am at the moment bidding on Sony prs-600 from Ebay, and thanks to your post, i might be using vpostasia to ship
Anyhow, where did you order the Nook from? I saw on its website that it will ship around 14 Feb, which i don't want to wait
Regarding your problem of registration, are you able to even buy the books from the website using PC? I've bought a book from them and now reading on my Blackberry.
Apparently BN checks for both US ip address and US creditcard. You will need some proxy and virtual c/c to overcome the country striction.
If you think i can help you can pm me krub.
Cheers,