Working with Office in Mac OS sometimes isn't as well organised or integrated as it is in Windows and Office Dock is an application designed to help organize your work environment and maximize efficiency.
If you're not happy with having all 5 major MS Office applications in your dock then Office Dock helps to reduce dock clutter. With a simple right click (or Control+click) on the Office Dock icon, you have access to all 5 applications in the Microsoft Office Suite.
It also allows you to launch Microsoft Office Applications and even allows you to bring the different Office applications to the foreground as and when you need them. Office Dock is designed to work with both the 2004 and 2008 versions of Microsoft Office. There's not much more you can do with it though after this and it would be nice to have a different icon for each application but it definitely keeps your dock cleaner.
Office Dock is a simple way to make MS Office cleaner and more accessible on your Mac.