Better late than never!
We're almost to the second major patch after the launch of MoP, and we still get a ton of questions about "shuffling". "I have extra Ore - what should I do with it?", etc.
So, I've created this flowchart. Presented are two versions - a .PNG file, and a .PDF file. Enjoy! And if you see any major errors, let me know and I'll upload an edited version:
Shuffle .PNG File
Shuffle .PDF File