Have you ever wanted to open up a new Finder window from the mac shell / command line via terminal. Turns out it is pretty easy to do using mac's open command.
To open up the current terminal directory in a new Finder window just run:
open .
To open your home directory in finder run this:
open ~
Your documents:
open ~/Documents
As you might have guessed you can type in any directory and it will open that up. You can also type in a file name and it will open it up using the default application.