OMG, I just went on their site and his listing is no longer there.
I had e-mailed the rescue lady this morning with a few questions, but haven't received a reply, though I'm sure she's super busy. Wow, if he was adopted today, they are very quick in updating their website. Luckily, they are open 7 days a week, so I can call in the morning to see if he's still available.
We were at a family event most of the day so we haven't been home all day. I am so sad thinking someone else got him. Maybe it's a sign it wasn't meant to be, but if he's still there in the morning, I'm going to get him!