I would like to see more dual interfaced applications where the focus is on expanding and making use of the strengths of the platform.
For instance, if I were to expand lb onto the desktop properly, I would expect it to have more management features and grand overview stuff thats impractical on the tablet.

Similar in a way to how itunes and the ipod pair each other up and complement themselves.

Theres many types of software out there that can coexist in a multi platform environment and which would benefit from getting away from a one size fits all attitude.