This is probably the only netbook remix feature I want ported to the regular builds. Globalmenu is broken in subtle but dealbreaking ways, and getting a large part of the ubuntu team on it should sort it out so I can finally use it. I hope there's a reasonable path to including it in the standard desktop.
This is only attainable when all windows are always maximized like they are in Netbook Remix, especially in combination with their design choice of having the window title display there by default with the menu appearing on rollover/alt. This all works because they're using a custom (probably non-reparenting) window manager and can do whatever they want.
This has the added bonus of potentially working with third-party apps that they can't diddle with the menus of — in this case they can just draw the window title decorator on top of the menus. They might even just take this approach all the time and avoid the globalmenu weirdness.