Apple just made one of those movements that I would have bet money against: from now, the beta of OS X versions are available for everyone, not just developers who are attached to the Apple Developer Program $ 99 per year. The change is already effective with the beta version of OS X 10.9.3 Mavericks.
All we have to do to enter the program and to settle the beta versions of OS X is log our Apple account on this site, where we are encouraged to "help OS X is better" testing a unreleased version of OS X via our feedback.
If you have always wanted to try the beta versions of OS X, this is your time. What comes to mind right now is: can we use the beta version of OS X 10.10 (supposedly) nothing being presented at the WWDC 2014? It would, of course, a big change from Apple.
