Howtogeek posted a tip about stopping the Office 2010 upload center icon from displaying in the Taskbar

One of the new features in Office 2010 is the ability to upload your files to Office Web Apps. When you do, an Upload Center icon appears in the Taskbar and helps manage documents. Here's how to stop it from showing up.
If you're running Office 2010 and upload files to the web, you'll notice the Microsoft Office Upload Center Icon appears on the Taskbar in the Notification Area. It will stay there even after you're done uploading the document and closed out of all Office apps.

You can use this to monitor and control the documents you're uploading to the web.

  Stop Office 2010 Upload Center Icon from Displaying in the Taskbar