I have two monitors and want my tool windows on my right monitor and the main window with the image I'm working on, on my left.

Here is my script:

if (get_application_name()=="GNU Image Manipulation Program") then
set_window_position(100,100)
maximize();
end
if (get_window_name()=="Undo") then
set_window_position(3300,0)
end
if (get_window_name()=="Toolbox - Tool Options") then
set_window_position(1901,0)
end
if (get_window_name()=="Layers") then
set_window_position(2210,0)
end
if (get_window_name()=="Brushes") then
set_window_position(2665,0)
end
if (get_window_name()=="New Layer") then
set_window_position(2100,200)
end

This works PERFECTLY, thank you! 

The problem is though, I have to re-run Devilspie2 to get it to arrange them.  Which is a little painful.