if changes is made to a class, the class icon in the project tree will change color.
BUT, the package icon (immediate parent folder) does not change in color to indicate that the member of the package is changed.
This feature is now in eclipse. The class icon has a ">" in front of it and so is the package (folder) icon.
This is an extremely handy feature. It's time for Intillj to steal some of the eclipse ideas... ;)