Google Communities

One place where I've been doing a lot of reading and researching is in the Google Communities.  In short it's loaded with forums on specific Google products.  For example, I'm keep tabs on the following Google services: Classroom, Docs and Drive, iPads in the Classroom, Apps for Educators, Google Docs Tips and Google Apps in Education.  Since many groups have the same name or content, one tip when looking to join a community is to see how many members are in the group which will give you a good idea of which ones are most popular and most active.