Be a beta tester for Apple. Really. From Macworld:
Ever dreamed of an opportunity to try out new versions of OS X before they’re released, but without having to pony up the $99 to become a registered developer? Well, that opportunity’s here: On Tuesday, Apple announced a new initiative, the OS X Beta Seed Program.
As part of the Beta Seed Program, users can register to receive pre-release versions of OS X, starting with OS X 10.9.3, which is available beginning on Tuesday. By trying out the new software and providing feedback to Apple, users can help shape the direction of the company’s desktop computer OS.…
Apple launches Beta Seed for OS X program for end users has more details.