Who says you can't teach an old dog new tricks? Bark intelligently brings notifications from Growl into Notification Center under OS X Mountain Lion.
Attention! Bark 1.1 is incompatible with Mac OS X 10.9 Mavericks. We are currently working on an update. Thank you for your patience. Follow @pandamonia on Twitter for updates.
With no-brainer installation and painless use, it'll be the easiest thing you've ever done with Growl.