Ok, I am starting a few new guides on setting up and using MongoDB (first on a ubuntu server and then on a sharded cluster on AWS servers using MongoDB Atlas).
here is my first guide.
Installing MongoDB onto a Digital Ocean Ubuntu 14.04 server
http://fearby.com/installing-mongodb-onto-a-digital-ocean-ubuntu-14-04-server/
I really want to find/develop a Mongo driver for Corona to use MongoDB (rather than bounce via NodeJS.
I hope this helps the community.