Mac (Mountain Lion): There are lots of different ways to remind ourselves to do things, including to-do lists, task lists or calendars. But if you’re looking for something much simpler that just reminds you to do something in a specified period of time, Scheduled Notifications does the job.
Notification Center is one of Mountain Lion’s coolest features, but not everyone likes it. If you want to get rid of Notification Center completely, OS X Daily shows off a simple terminal command to do just that.
Mountain Lion’s system-wide notification banners can occasionally cover up something that you need to click. Luckily, a quick flick can get rid of them instantly.