In Eclipse you can check the “Link with Editor” option and whatever source file you are viewing in the current tab will be highlighted and have its package expanded in the Package Explorer view.
Is there something equivalent to this in IntelliJ IDEA 8.1?
Update (2020, eleven years later): see "Source code navigation / Locate a file in the Project tool window"
Original answer (2009)
That would be
: Autoscroll from Source.
Navigate from a file in the Editor that gets the focus, to the corresponding node in the Project Tool Window.
Fried Hoeben comments that