After the Japanese tsunami and what seemed like absolutely ages, many delays later Pokemon Global Link is now open to everyone in the entire world! The rest of the world don't get the current promos and stuff Japan already has though- we have to wait.
The page is here- choose your language, get your Pokemon Trainer Club account up (yep, no more Japan-only Daisuki Club!) and your Game Sync ID and you can begin!
http://www.pokemon-gl.com/
Other than a translation, the Dream World is identical to the Japanese one. Strange that I could get in on day one...I expected a larger crowd. Must be the time zone difference.
