Adding Dropbox to the Windows 7 Send To context menu makes adding files to Dropbox easier.
Click Start and type: %APPDATA%\Microsoft\Windows\SendTo in the Search box and hit Enter.
Now right click the Dropbox folder under Favorites and hold down the mouse button.
Release the folder then select Create Shortcuts Here. If you don’t have Dropbox listed under Favorites, drag the Dropbox icon from where it’s located.
This puts a shortcut to Dropbox in the Send To directory. Close out of the Explorer window.
To help identify the folder locations, rename the shortcuts.
Now when you right click a file or folder, Dropbox appears on the Context Menu.
If you have several folders in Dropbox, use the same steps to drill down to specific folders in Dropbox. Here’s an example of a few different folders from my Dropbox directory.