Google Apps webinars are free and anyone can register.
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
Google teamed up with lynda.com to produce some great overview videos. eLearning Videos
3rd Party Apps