Since version 15 (I don't know exactly) MC supports the new Windows 7 Aero features like Aero-Snap. But the behaviour of MC is different from other programms (Windows Explorer or Word).
I use two monitors and Aero-Snap is very useful for these.
In general I can click on the top title-bar of any window (Windows Explorer, Word, etc.) and drag the window to the second monitor. I can drag the window against the top border of the screen and the window maximizes.
With the same procedure I can arrange two windows side by side if I drag the window against the left or right border.
When MC starts in fullscreen I'm not able to drag the MC-window (click and hold left-mouse-button on title-bar). If the window is restored then I can drag the MC-window to my second monitor or against the aby screen border.
First I have to restore the MC-window, then it works (even when I maximize the window to fullscreen).