The easiest place to see the various profiles with that special label is in this Google AdWords Help thread. It is the thread where AdWordsPro Sarah specifically requested pros to let her know that they are pros, so she can apply the label to their accounts.
Here is an example of one profile with the special label that reads, "Google Advertising Professional."
Clearly this makes these profiles stand out and look more authoritative than others. Now, if only Google certified SEOs. ;-)
Forum discussion at Google AdWords Help.