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?
At IntelliJ IDEA 12 (13, 14 and 15 from comments), it is located at the gear icon into the "Project" Tool Window, called as our mate said, Autoscroll from source
check the image
I hope this can helps someone else :)