The helpful companion to the OSX notifications center Growl per default logs all received notifications. You can define how big the log may get or disable logging in the application.
Since the latest update Growl offers to forward all notifications to the OS X Notification Center.
Does OS X log Notifications Center messages as well? If yes, where can I find them?
Why I am asking this:
OS X logs all your downloads in a SQLite 3.x database. I want to know if something similar happens with notifications as well. This could be a privacy issue when thinking of private messages or e-mails if too much information is stored.