Yes you can apply. You have to full out and sign the W-8 Form, Can Spam and TOS Agreement form and then send it to them via post I believe. It's infact the only CPA Affiliate Network that I know where you have to post the forms through a postal service. It helps to prevent people signing up to just fraud them though I guess, which is a benefit to them.
I signed up for azoogle from outside the US with no problems. I was just getting on well with Mona, my affiliate manager but she seems to have disappeared!