The Great Hotel Room Lottery for Comic-Con 2013 is tomorrow. Before then, you should go to this page, read up on how it works and decide on some hotels wherein you might wish to lay your sleepy head.
They have more rooms than ever available this year. This probably means they'll all sell out in twenty minutes instead of fifteen…but if you get shut out, don't despair. More will become available later. Each year, I get angry/weepy calls and e-mails from friends who didn't get a room and who somehow think there's a reason to complain to me. I can do nothing to help you, people. A few weeks later, almost 100% of these folks manage somehow to secure a place to stay and all is well. Happy hunting!