jedifreac makes a
really good argument about numbers and the "cost of appeal" argument you hear so often against casting people of colour (or women, or any other minority, really) in lead roles, especially as to how that argument fails in regards to Avatar: The Last Airbender.
Also, here's
another article covering the racebending! Featuring Shyamalan going "no comment", which is possibly the smartest move (other than, you know, not whitewashing the entire damn movie). Post about the article is on the comm
here.