If you're running IntelliJ IDEA on Mac OS X then you may already know this, but there is a way to tell IDEA to put its menu items in the menubar at the very top of the screen. To do this, find your IDEA installation and look in the bin directory. Next, Ctrl-Click on the IDEA application and choose "Show Package Contents" from the popup menu. Open up the Info.plist file in the Contents directory and append the following text to the Root/Java/VMOptions element.
-Dapple.laf.useScreenMenuBar=true
A neat little tip that I picked up for gaining a few pixels real-estate. Incidently, you can also use this in your own Swing apps.