Knock twice on your iPhone to unlock your Mac. $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, based (as I assume Knock’s is) on Apple’s animation-heavy Mac Pro site. 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.