As far as I understand, you are applying for an API key, and you can do this with any Google account. It seems that different keys require different keys. To get a key for the Maps API, visit:
http://code.google.com/apis/maps/signup.html
Product catalog on Google Code . each of the products for which Google seems to offer some kind of interaction from the developers, some of which have API keys. Take a look at this page and visit the home page for each product to get a key.
In particular, you can look at the Google AJAX API page, which presents all the products for which the AJAX API exists.
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