I use 8-10 workbooks (with 10-20 worksheets each) on a constant basis all day long. Is there anything that will organize the workbooks in a similar fashion as the workbook organizes the worksheets? I would love to have one window open and be able to navigate through all the workbooks without having to go back and forth on the taskbar. Maybe some sort of tree view displaying all the workbooks or an extra set of tabs at the bottom?