I'm willing to bet its because A. Things just went up or B. They aren't up yet and I pulled the trigger way to fast on responding.
But Using Chrome or IE7 (blagh) It doesn't load.
I downloaded the installer, ran it. Tried reloading the page in Chrome. Hopped to IE7. Same thing in both.
Gets to 100%, says launching. Nothing happens.
Restarted my machine. Same thing. Curious. I don't believe I've missed any java updates but I'm going to check just to make sure.
In the installation directory, see if you have a launcher.log file and a projectx.log file. If you have either, can you post the contents here.