DropboxRootPath()

This function simply returns the path location of your Dropbox folder.
path=DropboxRootPath();
I find this useful for automatically setting up Matlab paths on multiple computers where I store my libraries on Dropbox
It works by reading the info.json file that Dropbox generates. I've tested this on Windows 7 and a Mac, but it should work on Linux. It should also work on earlier releases of Matlab but I've not tested that.