The demo crashes immediately.
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Duplicate of MC-998, please use the search function to see if your bug has already been submitted. Currently over 51% of tickets are being closed as duplicate.
The minecraft demo is not playable at all by Mac OS X users at the moment. And you close this report as duplicate of a bug report which is closed as invalid. If you provide a demo as a java applet, you cannot control the java version of the browser plugin, and really, requiring a user to downgrade to a now even unsupported java version is almost funny if it weren't even irresponsible. Have a look at recent security issues with java. You really always want the latest in your browser (if you don't even turn it off completely).
Worse, downgrading the java plugin on Mac OS X is not easily possible (aside from the fact that you don't want to do that, and especially not for playing a demo), Apple turned off their java 1.6 plugin, oracle only provides 1.7 for mac.
What follows is that Mac users are not able to try the demo, the fact that the demo crashes doesn't create trust that the full version will not crash as well, people already playing and loving minecraft on Mac OS cannot seriously recommend it to other Mac OS users ("here, you can just try the demo and see why it's great ... oh wait.")