There are different levels of Google Certification, all of which are beneficial to different people.
If you are a teacher, I highly recommend getting the Certified Educator Level 1. This amounts to a few lessons and a $10 test. You can read more about it on their Training Center page. This is a great way to make sure you understand how, as an educator, you can be using Google Apps.
There is a great FAQ area to learn more about what the test entails. You can also choose between the Level 1 or Level 2, you don't have to accomplish the first to complete the second.
If you choose to get certified, let me know! I plan to begin my plight this year now that my Masters is done. My plan is to get through all of them.
Also, if you thrive off of badges and things you can add to your resume, you can even us their badge on your website, resume, presentations, anything, to show you are certified. *Quick note* check the timelines to refresh your certification. Because Google is changing all the time, certificates have to be refreshed to ensure you are getting the most out of your hard work!
Fifth grade teacher in a 1:1 iPad classroom, sharing my journey with technology in the classroom