It is quite annoying that new Finder window always overlaps the existing one when created. Following is a short AppleScript that will open two Finder windows side-by-side.

Window sizes of the two Finders are based on Macbook Air’s 1440 x 900 as shown below:
Should specific folders are required when opening, add the following line after set bounds command.
set target of Finder window 1 to folder “<Name of Folder>” of folder “<Computer Name>” of folder “Users” of startup disk
Examples below show the opening of Documents or Downloads folder
set target of Finder window 1 to folder “Documents” of folder “tomair” of folder “Users” of startup disk
or
set target of Finder window 1 to folder “Downloads” of folder “tomair” of folder “Users” of startup disk
NOTE
Above Apple script is a simple and no-cost solution to get two folders showing up side-by-side. Should more sophisticated features be required, TotalFinder is a pretty good choice.

Tareq
2012/01/28 at 5:49 am
click “Go” then “ctrl” then “Enclosing Folder”
it will open a new window for “Finder”
—
Tareq