Thanks to Download Squad for alerting me to this neat application.
Shidewin is a simple tool that displays a list of all the windows your various applications have open. Choosing one then makes it visible on the current monitor.
It's mainly intended for the situation where you have dual monitors, especially a laptop with an external display.
You know the problem ... you're sitting at your desk, with an external monitor connected and close your laptop, without moving any apps on the second screen to the main one. When you get home and open it up again, you can't get at those windows, because you can no longer see them!
Mind you, I've certainly been in situations where I could have used it on a single monitor.
Sometimes windows just end up completely off the screen due to some kind of programming bug, so being able to reposition them would be handy.