And it's me again too - you just can't get away from me :-)
Funnily enough, I installed a second LCD to my setup on Saturday using the dual (DVI and VGA) outputs on my video card. No, you can't have the map on one screen and the interface on the other as you can't "undock" the map from the RB interface. You could drag the whole interface over 2 screens to give you a full screen map and a full screen interface if you wanted. Or you could leave half of one of the screens to display another program.
My problem is that the 2 screens I use are on different screen definitions, so this complicates it a bit if I drag across both. So what I do is have RB on the big screen and FireFox and my radio scanner interface on the other - it's like having 2 computers :-)
Hopefully, AirNav will develop RB to allow the map and/or the lists to be undocked.