Make windows that are off-screen, visible

There are times when an app will memorise its screen position.
If you have more than one monitor and switch their placement around, you may find that when that app is started, it is shown outside the monitor's visible area.

There are 2 ways to make it come back to the visible area:

1. Using the 'move' option
   Use Alt-Tab to select the app
   press Alt-space, M and then use the left/right keys to bring it into view
2. Use this neat little utility, called borderline

ps: Comments and/or links to this article are most welcome!