Blizzard has posted that tickets for this years BlizzCon are almost gone!!

Approximately half the available tickets for BlizzCon 2007 have been sold in the first 24 hours, and they're continuing to go rapidly. If you plan to attend, we recommend getting your tickets quickly, as they are likely to sell out soon. We thank you for your enthusiasm, and look forward to seeing all of you in Anaheim, California on August 3 and 4.

I suggest you get them while you can, and IF you can since so many people are having issues with the online payment system rejecting credit cards as invalid numbers!