Just a heads up, If you're reading this, I'm sure you know paypal's been having issues for a couple days. Looks like everything is back up and running, BUT...
I just checked around, and 25 people paid me through paypal, but I never received payment notification e-mails. For most people, it's fairly easy to see if someone has paid you or not, but with over 100 payments in the past 2-3 days, finding 25 missing ones is pretty friggin hard.
So, make sure you double check to see if people paid you!