In Mac OS X, there is a cool trick you can use when you are opening new folders in the Finder. It allows you to open new Finder windows, one for each new folder you care about. At it's simplest, the tip is to hold down the command key (on some keyboards, this will be the Alt or Apple key) and double click on a folder and the folder will open in a new window. But you can go even further. You can hold down the command key to select multiple folders. Then double click on one of the folders (while still holding down the command key) and the Finder will open a new window for each of the folders you selected.