Thanks — Perhaps I should have been more clear, I meant easing in and out along the x and y axis, not zooming in/out.
Another Yann example I've been using for something similar: construct.net/en
:)
Something like lerp(screenPositionX, screenTargetX, dt) should work too. Or did I misunderstand, you wish to smoothly scroll the screen from X,Y to another X,Y?