From http://stackoverflow.com/questions/11547997/hello-world-code-for-mountain-lion-osx-10-8-showing-notification-like-ichat

notification test

NSUserNotification *notification = [[NSUserNotification alloc] init];
[notification setTitle:@"Hello World"];
[notification setInformativeText:@"Hello world message"];
[notification setDeliveryDate:[NSDate dateWithTimeInterval:20 sinceDate:[NSDate date]]];
[notification setSoundName:NSUserNotificationDefaultSoundName];
NSUserNotificationCenter *center = [NSUserNotificationCenter defaultUserNotificationCenter];
[center scheduleNotification:notification];