From the IRS's own website:
http://www.irs.gov/publications/p515/ar02.html
Quote:
Form W-8. In most cases, a foreign person that is a beneficial owner of the income should give you a Form W-8. Until further notice, you can rely upon Forms W-8 that contain a P.O. box as a permanent residence address provided you do not know, or have reason to know, that the person providing the form is a U.S. person and that a street address is available. You may rely on Forms W-8 for which there is a U.S. mailing address provided you received the form prior to December 31, 2001.
If certain requirements are met, the foreign person can give you documentary evidence, rather than a Form W-8. You can rely on documentary evidence in lieu of a Form W-8 for a payment made in a U.S. possession.
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Oracle, icq me if you want me to send you an copy of the "USA Tax Certification Form ? Non-United States Citizen" form I use because W8 forms don't apply to my situation.
Every major mainstream program accepts it, so I guess it's fine

I stopped using AFF/FFN a few years ago, so I don't know what they'll do.