To my fellow PNer Apple folks,
Apple will be announcing the new operating system OSX Yosemite on Thursday and are you going to upgrade? With all the new interface actions between iOS 8 and your desktop or MacBook or MacBook Pro, I think that it is NeatoPeachiekeen to install it.
Before starting here is a good read....
How to Prepare a Mac for the OS X Yosemite Update the Right Way