For new members only. Try this link. Expires 06/15/08.
I got it in an email. This time, there's no promo code or coupon code, just a button to click in the email. I've tried to extract what I think is the relevant information from the URL. Let me know in the comments if it doesn't work. When I click it, it redirects me to my home page, since I'm already a member. You might have to delete your Netflix cookie to see it.