+1000. Why limit the actionable area to unveil a menu to an icon at the top left part of the scree (hard to reach on big screens), while the whole screen could be actionable.
I'm developing 3D Augmented Reality pie menus for Pantomime, that you pop up by touching the edge of the screen (which is easy when you're holding the phone), which pop up in the center of the screen where you can see them, you control them by tilting, they stay in the same position in 3D "augmented reality" space, and they provide nifty continuous animated feedback!
That way the actionable area is the entire space around you -- a LOT larger than the screen!
With normal cursor driven pie menus on a big desktop screen, the further you move the mouse, the more angular precision and leverage control you gain over the selection. Pantomime 3D AR pie menus let you tilt to point out a lot further than the edge of a tiny phone screen!
By the way: we're looking for investors, and we just won first place in the Digital Media / Mobile category of the Launch Silicon Valley Startup Competition!
http://www.newswest9.com/story/25616093/pantomime-corporatio...
David Levitt tells the story at 1:45: http://veetle.com/index.php/search/video/kctv8?play=94493d4b...
Please contact us if you're interested in learning more about Pantomime, or know other people who would be!