Init.d script for dropboxd adapted from http://www.dropboxwiki.com/tips-and-tricks/install-dropbox-in-an-entirely-text-based-linux-environment#Running_on_system_startup

dropbox

#!/bin/sh
DROPBOX_USERS="[put your username here]"
DAEMON=.dropbox-dist/dropboxd
DAEMON_ACTUAL=.dropbox-dist/*/dropbox

start() {
    echo "Starting dropbox..."
    for dbuser in $DROPBOX_USERS; do
    HOMEDIR=`getent passwd $dbuser | cut -d: -f6`
        if [ -x $HOMEDIR/$DAEMON ]; then
            HOME="$HOMEDIR" start-stop-daemon -b -o -c $dbuser -S -u $dbuser -x $HOMEDIR/$DAEMON
        fi
    done
}

stop() {
    echo "Stopping dropbox..."
    for dbuser in $DROPBOX_USERS; do
        HOMEDIR=`getent passwd $dbuser | cut -d: -f6`
        if [ -x $HOMEDIR/$DAEMON ]; then
            start-stop-daemon -o -c $dbuser -K -u $dbuser -x $HOMEDIR/$DAEMON_ACTUAL
        fi
    done
}

status() {
    for dbuser in $DROPBOX_USERS; do
        dbpid=`pgrep -u $dbuser dropbox`
        if [ -z $dbpid ] ; then
            echo "dropboxd for USER $dbuser: not running."
        else
            echo "dropboxd for USER $dbuser: running (pid $dbpid)"
        fi
    done
}

case "$1" in
    start)
        start
        ;;
    stop)
        stop
        ;;
    restart|reload|force-reload)
        stop
        start
        ;;
    status)
        status
        ;;
    *)
        echo "Usage: /etc/init.d/dropbox {start|stop|reload|force-reload|restart|status}"
        exit 1
esac

exit 0

Modified so the stop command will eventually work.