Realizing that the vertical toolbars / tab bars in the iPhone Duo will mean more buttons going icon-only, losing their labels. Better use of screen space, but maybe a step back for clarity and accessibility.
@manton It would be nice if iOS adopted the feature Android had, where you can long-press on an icon-only button to reveal it’s tooltip. This saved me from confusion a few times when the icon was a little too obscure. I guess that’ll mean they’ll need to make this work with actions where long-press actually does something (popup menu, perhaps?)