Hello - if you are planning on ordering OS X Leopard, I would ask that you consider pre-ordering it through our Amazon affiliate link. This is one of the few places that you can place a pre-order at this time.
http://www.cnet.com/products/mac-os-x-10-10-yosemite/ Some fairly cool things. FINALLY predictive texting for Iphone. I don't use a Mac, so I can't say if the things that are computer specific are terrific innovations or not.