With the new Notification Center feature in Mac OS Mountain Lion you can make it more useful by using Hiss. Hiss is  a free application that sends apps Growl notifications directly to Mountain Lion’s desktop notification panel. That’s all the app basically does, but it’s a great utility and worth downloading for those who are using the OS X 10.8. Right now there simply aren’t that many apps that have Notification Center support, although this will certainly change as time goes on. Chances are reasonably high that Growl itself will end up tying similar functionality into future releases of their apps, but Hiss should bridge the gap for now.