The video shows me pressing a pen then my finger on the touch screen.  The value on screen is a number between 0 and 1; zero indicating no pressure and one indicating alot of pressure.  Sorry about the quality.

[youtube=http://www.youtube.com/watch?v=m_nwqj0rlb4]

You could imagine building a web painting application that varies the thickness of a line based on how hard you press, or the Fennec browser app could vary the speed of the scroll based on how hard the user presses on the scroll area.

Before this makes it into the project, there are a bunch of unanswered questions in the bug.  Mostly questions relate to how we expose this property in the DOM, and how to gather this pressure information from the platforms.