The rocky launch of ticket sales for BlizzCon 2008 continues, as the BlizzCon 2008 Website states they will "post another update here when tickets are up for sale again." They also point out the WoW Forums will have updates in the meantime on the status of BlizzCon ticket sales. Confusingly, that forum contradicts the BlizzCon Website saying these sales are now underway:

Update: 12:50 PM PDT - Ticket sales are now available again. We thank you for your patience as we worked on all of the updates to handle the ongoing load of purchase requests.