OfficeTab adds tabs to Word, Excel and Powerpoint
You can choose to add tabs to some or all of the apps OfficeTab supports, in case you want them in Word, but not in PowerPoint, for example. OfficeTab doesn't take up much space, it just keeps your tabs in a standard-sized toolbar. You can even view your documents side-by-side in the same window, which is handy for comparing drafts. OfficeTab works in Office 2003 and 2007 on Windows XP, Vista or 7. It's made by a Chinese developer, so both Chinese and English versions are available.
[via Slashnow. Thanks, Ben!]