Add Your Own Folders to the Finder Sidebar in Mac OS X
You can add any of your own folders to the Finder window sidebar in Mac OS X just by selecting a folder and hitting Command+T or if you can just drag a folder into the “Places” section of the sidebar.
This is especially useful for accessing frequently accessed folders and projects that you don’t want clogging up your Dock or cluttering the desktop. When you want to remove the folder from the sidebar, just hold down the Command key and drag them out.
This trick came via a comment on yesterdays post about customizing the Finder window toolbar, thanks to Bikorchi for the tip.