Creates task bars for each monitor. Puts "move to other monitor" and "maximize across all monitors" buttons on title bars and on window/task bar system menus. Lets you drag maximized windows to other desktops. Also does some other stuff I haven't tried yet. I like it so far, especially the multiple task bar thing.
[link|http://www.realtimesoft.com/ultramon/|http://www.realtimesoft.com/ultramon/]