Most of my purchases have shown up within half an hour (usually ten minutes or so). The only time it didn't was when I bought a vid and it took a couple days, PMs, emails and a phone call to get it sorted. Apparently there is something that screws up with Paypal on occasion. However that purchase wasn't made on a busy day like today so maybe wait it out a little longer. I'm sure it'll be a nightmare trying to get a hold of anyone there today anyway.
Good luck.
Edit: Well there you go. On the way to being fixed while I was typing. Once the dudes knew what was up with my order it got fixed.