One of the best parts of the iPad 2 is the colorful, magical smart cover that comes as a peripheral. Lift the cover and your iPad turns on, drop it and it goes to sleep. It's kind of addictive. But what if someone actually built an app around that fidgety behavior? Well, Evernote just did. It's called Evernote Peek , a free app for the iPad 2 that is designed around the smart cover. It is the first smart cover app, and it may even make you smarter.