Wow, people actually want that? I hate it with a passion whenever I use OS X, and honestly thought they just kept it for historical reasons and that no one actually likes it that way. Clearly I was wrong based on the reactions here.
I hate it because if you're moving between two apps it adds a click or keystroke to select the app before you can select the menu, and if the app is not at the top of the screen you also have to move the mouse farther.
People who love this, what is the benefit? Is it just to save a few vertical pixels if you have two apps above each other, or is there more to it?