[Knock twice on your iPhone to unlock your Mac.][link] $3.99 on the App Store, and a really nice site that commits one major sin: Hijacking the user’s scroll momentum to guide them through the sections. This is happening a lot these days.
We did some demos of this at Occipital for the [Structure Sensor website][structure], based (as I assume Knock’s is) on Apple’s animation-heavy [Mac Pro site][mac]. It *looked* really cool, but in the end it never “felt” right. After demoing it to a friend of mine his only feedback was “Just let me scroll.” It’s good advice.
[link]: http://www.knocktounlock.com/ “Faster and safer than typing a password. Just Knock. For iPhone + Mac.”
[mac]: http://www.apple.com/mac-pro/ “Apple – Mac Pro”
[structure]: http://structure.io “The Structure Sensor”