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Growl still has more uses than the simple notification paradigm being ported from iOS. I remember using growl tunes to display song titles music video style. Similarly I used different notification themes for different applications. Some notifications never left the screen and didn't have to be invoked in a separate shelf. Apple's notifications also won't display when AirPlay mirroring. These are all minor cases where someone might get more use out of growl (the old one anyway) than NC. Since they arent trying to compete to be everyone's solution, they can still appeal to those fringe cases.
 
I have been very unclear about how, or whether, NC would work with third-party applications? Will it always work only with Apple ones? Or, like the autosave feature introduced in Lion, will it require specially rewritten apps? Then it would take months or years before my apps become NC-friendly, right?

Developers will have to update their applications, yes. It's easy to do, so it won't take "years" or an app rewrite.
 
Growl still has more uses than the simple notification paradigm being ported from iOS. I remember using growl tunes to display song titles music video style. Similarly I used different notification themes for different applications. Some notifications never left the screen and didn't have to be invoked in a separate shelf. Apple's notifications also won't display when AirPlay mirroring. These are all minor cases where someone might get more use out of growl (the old one anyway) than NC. Since they arent trying to compete to be everyone's solution, they can still appeal to those fringe cases.

Growl also is available on other hard- and software platforms, it works over networks and it's open source. Apple should have integrated Growl instead of cooking up their own proprietary soup again.
 
I'm a little sad that Apple decided to go in-house rather than working with Growl, which has been around for some time now and improved on some shortcomings of OSX.

It also bothers me because Apple is unhesitant about suing competitors (Samsung for example) or sending cease and desist letters when they "copy" their ideas... but Apple is doing the same thing here. :(

Fixed that for you...
It's like Notifiception! :p
 
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