Nice and customisable controls with touch support
Everyone needs to show data to users in a nice way. I think WPF lacks enough basic controls with touch support, e.g.:
ScrollViewer with fancy finger scrolling and GPU acceleration
StackPanel with item drang&drop sorting
ScrollViewer with 3D scrolling and GPU acceleration
I think, Surface controls are pretty nice but we need more. SurfaceScrollViewer is the best in Surface controls but verry buggy (too many times I scroll down and the result is that I am still at the same position). Also we need to control scrolling animation length and scrolling velocity.
Simplified: We need fancy customisable controls smartphones-like.