I've been working on articulating some of the theory behind mobile UI
design, by examining current algorithms and heuristics from the entire
field. I'd like some feedback (blog post at [1]). I've got further
analysis with specific design recommendations at [2], but that is a
topic for a different message.
Mouse driven interfaces (software) – the "large" controls are the
edges of the screen, as they are really infinitely large in one
direction. Corners are larger still. Thus frequently used items should
go around the edges.