Apple's OS X beta program.
Gone are those days when Apple launched beta’s to developers for testing. Apple has launched a beta program for the public this time and you can signup to beta test the next release of OS X from here. Apple’s OS X beta program is really cool, given we get to try it before the vast majority of the public. I try beta’s for most products, the Chrome and Firefox that I use are running developer/beta builds right now. That is how I try to stay on the edge of technology. Anyways, if you are like me, you should try the OS X beta’s.