Alexa is a good "estimate" but thats it. Their rankings involve mostly result from the alexa toolbar, it tracks where people go. A large percentage of surfers with their toolbar reporting to them are Korean and then other Asian countries. SO.. if the koreans and other Asian like your site, you will triple your rankings, hence the reason so many of their top 500 sites are korean, and japanese. Iff you want to boost your rankings, translate your site into korean and do some advertising in Korean sites, you will se a huge jump in your ranking with a small increase in your korean traffic.
