There is an entire section in Google in Education that provides a wide variety of resources for teachers professional development using different Google services. I have been writing about these services each in separate posts in the last couple of months and now I am compiling them all in one page for you to access whenever needs be.
1- Google App User Groups
This is a page where you have access to a wide variety of groups of Google apps users. The goal of these groups is to provide Google Apps users with a platform where they can connect with other Google Apps users from all over the world to learn and share best practices, custom solutions, and resources from each other through discussion forums, events, and webinars.
2- Google Teacher Academy
A professional development experience designed to help educators from around the globe get the most from innovative Google technologies
3- Google Education on Air
Connect with and learn from educators around the world using Google+ Hangouts. You have the best seat in the house.
4- Google Education Trainers
Designed for organizations and individuals to provide professional training and support to schools using Google technologies.
5- Google in Education Videos
Browse video trainings and case studies to see how educators and students are teaching, learning, and working together with Google tools.
6- Google Plus Community
Share with and learn from others using Google Apps for Education.