Sync a File or Folder with Dropbox

Dropbox.applescript

on run {input, parameters}
        repeat with i from 1 to (count input)
                set posix_path to POSIX path of (item i of input)
                if posix_path ends with "/" then set posix_path to ¬
                        text 1 thru -2 of posix_path
                set AppleScript's text item delimiters to "/"
                set filesname to quoted form of text item -1 of posix_path
                do shell script "ln -s " & quoted form of posix_path ¬
                        & " " & "~/Dropbox/" & filesname
        end repeat

        return input
end run