I'm gonna go ahead and say these NVSE tuts from DoctaSax @ loverslab were quite useful to me.
http://www.loverslab.com/topic/26749-tutorial-nvse4-part-1-syntax-and-expressions/
http://www.loverslab.com/topic/26802-tutorial-nvse4-part-2-user-defined-functions-udfs/
http://www.loverslab.com/topic/26963-tutorial-nvse4-part-3-string-variables/
http://www.loverslab.com/topic/27076-tutorial-nvse4-part-4-array-variables/
http://www.loverslab.com/topic/39417-tutorial-nvse4-part-5-event-handlers-user-defined-events-udes