Running dual head monitors on an nvidia geforce 4 ti4200 using the twinview
settings in my XF86Config.

I noticed that in my second monitor, with no panels on it at all, I cannot
drag or maximize windows to the very top of the screen, they are stopped by
the bottom of where the panel is on the main screen. 

I'm guessing that metacity is just stopping the window from going over
where it thinks the panel is, even though it's on the wrong screen.