The Google Apps Training Center is a great place to start learning more about the core Google Apps. 

Google Apps for Education Webinars 
The link below will take you the archive of webinars produced by Google. These session go in depth on a wide variety of topics.
Google Apps for education webinars  

  eLearning Videos
Google teamed up with to produce some great overview videos. eLearning Videos

3rd Party Apps

Google Apps webinars are free and anyone can register.