Most of the info comes directly from questions/answers submitted to the GrADS mailling list, I only took some time for properly formating them.
By the way, help is always wellcome. If you think you can write a question/answer topic, just send me an email and I will put your text here. In the same way, if you try some of the code and it does not work, please warn me... Or if my english does not sound like english, just send me and email... Or if you are from COLA/GrADS and you think COLA/GrADS would like to take care of this page, just write me.
EMAIL: I'm trying to avoid spams, so you have to solve the puzzle :-)
username is hmjbarbosa and the email server is gmail.com