I'm using IDEA 7 final on Java 6
java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode, sharing)
on Ubuntu Feisty.
With IDEA 7, menus and menu items are using the default Java font (Lucida, I think), rather than a font specific to the look and feel. If I change to GTK+ look and feel the menus do pick up that font.
On IDEA 6, menus respect the L&F font settings.
I can file an issue with a screenshot if that helps