[notting@nostromo: ~]$ dbus-send --system --print-reply --type=method_call  --dest=edu.duke.linux.yum /Updatesd edu.duke.linux.yum.GetUpdateInfo
Error org.freedesktop.DBus.Python.ValueError: Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/dbus/service.py", line 488, in _message_cb
    _method_reply_return(connection, message, method_name, signature, *retval)
  File "/usr/lib/python2.5/site-packages/dbus/service.py", line 236, in _method_reply_return
    signature = reply.guess_signature(retval) + ' (guessed)'
ValueError: Unable to guess signature from an empty list