I don't know if this is what you are looking for, but if you command+click on an icon in the dock, it takes you to the containing folder.
So if you have Terminal in the Dock, like I do, then Command+Clicking that will take me to the Utilities folder within the application folder.
Command+Clicking on iTunes takes me to the main Applications folder.
You can also set the Finder to open on a different default folder than it does. I haven't messed with what I had it set to in Tiger since I seldom open up Finder via the icon.