For years, Growl was the good old, third-party standby when it came to OS X notifications, but with Mountan Lion, Apple’s ported Notification Center to OS X, giving everyone a built-in drawer for keeping up with all the little messages their apps send burbling up for attention. Unfortunately, while a lot of apps still use Growl for notifications, these don’t show up in Notification Center.
Growl will eventually be updated with Notification Center support, solving the problem, but in the meantime, here’s another great way to do the same thing: Mountain Growl. Not only will it push all your Growl notifications to Notification Center, but you keep full Growl support, allowing you to continue using remote notifications or Prowl, as well as a lot of granularity of control over the notifications you see.
If you’ve been having a hard time waiting for Growl to get proper Mountain Lion support, this is a good app to try.