Oooh, this is pretty. MacThemes forum user SkyJohn has created a theme for Growl that emulates iOS 5 style notifications. It’s not a perfect fit, but it does exhibit the same cube animation you see when you get a notification under iOS 5 on your iPhone or iPad.
Don’t have Growl? The popular notification system for the Mac is now available for $1.99 on the Mac App Store. You can also download an older free version, but be warned: because of the changes Apple will be instituting to Mac App Store apps early next year, the free version of Growl will not work with sandboxed Mac App Store apps.
For a look at how sandboxing can affect your Mac apps, check out our editorial here.