I have been fortunate to have other people make resources after using g(Math) themselves. Here is a list of resources that other people have allowed me to share. If you created a resource and you want me to share it here, please let me know via Twitter: @jmacattak or Google+: google.com/+JohnMcGowan.

Some user created tutorials:

+Jeremy Bell's tutorial:
http://jeremyteachhacks.blogspot.sg/2014/06/how-to-create-math-documents-quick-and.html

+Phil Ballard's review:
http://www.mousewhisperer.co.uk/drivebunny/add-on-review-gmath-for-google-documents

+Greg Lawrence's tutorial:
https://www.youtube.com/watch?v=s6bKSkgV2ak

+Michael Mitchell's tutorial:
https://www.youtube.com/watch?v=7eoyliyh7xw

+Kevin Fairchild's video help:
http://www.youtube.com/playlist?list=PLto2no0G6EAwH1z9Br39pqmqNiS38VKmP