Google Advertising Professional:

The Google Advertising Professional program is a program which allows marketers
to be certified as a Google AdWords expert. The requirements are that you spend
at least $1,000 in a 90 day period after signing up, comply with their rules, and pass
a test. After the 90 day period is up you can place a logo on your site which will
perhaps make many people assume that Google endorses all of your SEO / SEM
services.

The new program also allows you to link together up to 500 AdWords accounts so
that you can access and manage them from a single login. Google also offers many
free online tutorials which can help prepare you for the test and help you learn
more about AdWords even if you do not want to take the test.