http://newbiescriptersbible.freewebspace.com
That is updated to version 2.17 I think. It goes over every single command.
I still have the old file npcprogramming.doc. I think that's a good place to start as well. I don't know if I can post it though. It no longer comes with the game either. Now everything new is posted in the newfeatures2002.txt.