BlizzCon 2008 Website has word that the glitch from earlier (story) is fixed, and that BlizzCon 2008 ticket sales are underway. Word is:

This morning, we experienced some technical difficulties with ticket sales for BlizzCon. Please be aware that no tickets were sold during the service interruption. If you reached the confirmation screen but did not receive an email receipt, the order did not go through.

We have found and addressed the source of this morning's issues, and ticket sales are now functioning correctly (though extremely high traffic volumes may still result in occasional delays). We'd like to apologize for the inconveniences caused by these issues, and to thank you for your patience as we resolved them.