iPhone’s disappearing spacebar
Written by on June 28th, 2007 in Ajax News.
The iPhone keyboard video shows how the spacebar is replaced by web-centric options when you’re entering a URL.

URLs can’t contain blank spaces so the iPhone gets rid of the useless key and replace it with ones that add value. Great example of context over consistency.
Source: Signal vs. Noise
Original Article: http://www.37signals.com/svn/posts/492-iphones-disappearing-spacebar