The beta test for Final Fantasy XIV was due to kick off yesterday. It didn't happen. The problem was "critical bugs". Fret not! Developer Square Enix will have the beta up and running soon.
The beta is set to start on September 1. From the game's official site:
FINAL FANTASY XIV Open Beta Test Will Start on Sep. 1!
We would like to take this opportunity to provide an update regarding FINAL FANTASY XIV Open Beta Test, which was announced to be postponed on Aug. 31, 2010.
Along with the completion on investigation and correction of the critical issue, we have decided to begin FINAL FANTASY XIV Open Beta Test on Sep. 1, 2010 at 19:00 (PDT).
Starting on Sep. 1, 2010 at 19:00 (PDT), acquisition of registration code required for FINAL FANTASY XIV Open Beta Test will be available.
This is for North American players. For players in Europe and Japan, the beta will begin on September 2 due to the time difference.
Final Fantasy XIV [Official Site]