After years of using just a MBP I recently got myself a second display. Its great, though I'm still getting used to it.
One thing that bothered me a lot in the beginning was dragging around windows from one screen to another. So I was looking for some applescript to ease my pain.
I found it here: http://superuser.com/questions/331313/h ... -keystroke
It wouldn't be me if I would not package it into a an "real" action including a custom icon.
You can download it here!