In two of my blog posts of 2010 I have featured AeroSnap and FreeSnap, at these links : http://rhodesfamily.org/Blog////index.php/2010/04/23/great-little-piece-of-software-aerosnap plus http://rhodesfamily.org/Blog////index.php/2010/07/04/freesnap
I have discovered a new piece of software that takes the best of both programs and added additional features–it is called AquaSnap. On AeroSnap you can view only two windows vertically, by dragging and dropping the program window to one side of the screen. When using FreeSnap you can view up to four windows both vertically and horizontally, but you will need to use the keyboard to do so.
AquaSnap is the best of both worlds, like FreeSnap, you can view up to four windows both vertically and horizontally, and in any combination. Similar to AeroSnap, with AquaSnap you are dragging and dropping a program window to different parts of the screen, without touching the keyboard.

  
  
In my book this is a must have program for any genealogist, and mutitasker.

The following is a link to HowtoGeek.com where they have a great review and how-to overview of AquaSnap here.
Here is the program page link.