Beginning March 31, 2007, AdWords promotional credit coupons will only be available to Qualified Individuals and Qualified Companies in the Google Advertising Professionals program.
There's a link to "learn more" but that link appears to be broken - it leads to a page that says "We're sorry, but the information you've requested cannot be found. Please try searching or browsing the AdWords Help Center for answers to your AdWords questions."
But there's no information there either.
What's the new credits policy?
Beginning March 31, 2007, promotional credits will only be available to Qualified Individuals and Qualified Companies in the Google Advertising Professionals program. Program participants without qualified status will no longer be eligible for promotional credits.
If you currently have promotional credits but are not yet qualified, your existing credits will be no longer be valid after this date,and no new credits will be issued unless you become qualified.
We've made this policy change to reflect the increasing levels of service required by qualified program members to deliver high-quality AdWords services to customers. By issuing promotional credits only to qualified program members, we hope to ensure that customer acquisition funds are being spent appropriately.
If you're not yet qualified, this is a great time to take that next step so you can continue receiving promotional credits.