Looking for info on Australoids

[the mathemagician]

I'm really curious on Australoid groups, regardless of where they might be found. Photos are rather interesting (Corbis has plenty) but I'd like some reading. I'd really like to know if there is some evolutionary explanation for their lighter hair color. They're the only people I've seen that have natural light hair apart from Europeans.

Can anyone recommend any books or reputable websites? Thanks!