If there's one thing I don't like about Mac OS X, it's that it's all too easy to delete a printer. I've done it a few times when I thought I was deleting a print job. At the very least, I'd like to see some sort of "Are you sure you want to delete this printer?" query. Better yet, lock it down and require admin intervention to delete it.
Now normally, this isn't a problem. If you delete a printer, you can just plug it back in again, and OS X will re-discover it. But Adobe's "Acrobat Distiller" is a virtual printer, not a real one. And if you delete it, Mac OS X can't automatically "re-discover" it because technically, the printer doesn't exist. If you are unlucky enough to delete Distiller, as I did, getting it to re-appear is more than a little bit difficult.