Dropbox is one of the coolest utilities available today to backup and share files and folders online. If you want easier access to it, you might want to add it to the Send To Menu in the Context Menu.
Add Dropbox to Send To Menu in Vista & Windows 7
First navigate to the following path by copying the following into the Windows Explorer address bar or the Search box in the Start Menu.

%APPDATA%\Microsoft\Windows\SendTo

If you have Dropbox under Favorites right-click on the folder and drag it into the SendTo folder. If it’s not under your Favorites in Explorer, just drag it to the SendTo folder from whatever directory you have it in.

When you release the folder you’ll have the option to move, copy, or create a shortcut…you can certainly move it there if you want, but we’re going to create a shortcut.

Now when you right-click on a file or folder you’ll have the option to send it to your Dropbox folder.

If you have other shared folders in your Dropbox folder you can add them to the SendTo Menu as well using the same method. Like in this example we added a shared Dropbox folder we use for testing geek stuff.

Add Dropbox to Send To Menu in XP
In XP go to Control Panel and Folder Options then select Show hidden files and folders.

Navigate to C:\Documents and Settings\[User Name]\SendTo (where User Name is the name of your computer) and create a shortcut to your Dropbox folder.

Now you have your Dropbox folder added to Send To in the Context Menu…

If you use Send To from the Context Menu in Windows, this is a good way to easily add files and folders to your Dropbox folders