Do check out WoW Insider's tips to getting yourself ready for the ticket push, and most importantly, don't assume that you can wait five minutes before logging on to obtain a few tickets. These sell out incredibly quickly, and you'll need to be ready to go in advance of the scheduled time, with your finger working that F5 key to destruction so that you can get into the queue in a decent position. Don't alt-tab around, don't get a coffee.
If you can recruit friends, do! Working as a group can be the very best way to try to ensure that you can secure tickets for you and your friends. You'll need a little organization and communication, but it's worth it, this is BlizzCon, people! This time of day is also far more sociable for the EU than the previous time, so bear that in mind when planning your raid on the battle.net site. Pre-pot for this one!
There are also tickets to an exclusive pre-BlizzCon dinner to benefit Children's Hospital of Orange County go on sale Wednesday, May 1 at 7 p.m. PDT. These are more expensive at $500, and do include a ticket to BlizzCon itself. You can visit the Blizzcon Ticket Information Page for more information.