As an answer to SIMPLE flashing with a mac, I'd recommend using the 770 Flasher
http://www.bleb.org/software/770/
On both the n770 I had and the n800 I now am using, this works fine, and is a good starting point for users expecting simplicity of the windows updater.
Enabling RD mode, and more in-depth of flasher does require a basic knowledge of CLI, but those topics aren't really basic level anyway.