Digging this this back up....
I recently purchased a new 15" MBP from Hong Kong (online apple store) as the prices between Hong Kong and China greatly vary. Now, even though I'm currently living in China I'm a US citizen and plan to register the computer using my US address. Is it possible to buy the AppleCare from the US and apply it to the Hong Kong purchased MBP?[/QUOTE
Why not buy it from the HK store. Isn't the warranty worldwide? I suspect you may only be able to buy AppleCare from the store that you bought the MBP from.