Ditto on Jeff and Ambush. Working with SW spanning two monitors is not usually worth it. I've only done that when I needed to see two SW docs side by side. For a single doc, I did't find it helpful. Moving toolbars and such to the second monitor has not been well supported by SW.
I also moved my taskbar to the side of the 2nd monitor (right side in my case). I added toolbars to it with links to common apps and docs. Also, task buttons don't get bunched up until there are literally dozens of them. With the taskbar on the side, you can actually see the name of the application, and the document that is open (depending on the width of the task bar). So, if you're shopping around and have 6 browsers open or something, you can see which is which.