I am an Adobe Certified Instructor. there were a few steps. First you take the ACE exam (Adobe Certified Expert) and then you take the CompTIA CTT (Certified Technical Trainer exam) which is a written exam on best practices of teaching and then their is a stand-up teach which makes you an ACI. And then you have to take the ACE exam for every app that you want to be certified to teach. Then you would be able to teach for Adobe Authorized Training Centers around the world.
However, over the years creating new exams seemed to have paused... every once in a while I hear they are coming out with new exams. Every year we have to update our certifications by taking the latest exams... but since they have not been creating the latest exams.. I think what you are seesing is partners that have certified in the past.
hope that helps.
oh boy! I just realized this post was from 2008! DOH!