DOOBIEXX Great software that's very stableand works perfectly for having a window vertical or horizontal half-way.
They make another program named SizeUp, which I have suggested up top, made by the same dev's but is shareware... it costs $1.35 or something like that lol, they just ask that you make some sort of donation if you like and use the app. They ask that you pay whatever you like based on how useful the software is to you.
This app allows you to put a window in the top right corner or left corner or bottom right/left... you can easily have 4 different or same application windows easily placed on your screen for easy comparison or drag-n-drop. Great app. Definitely check out: SIZEUP , click link above.
(Version 1.0.2)