I made this script for my own use. I guess one has to be pretty techy to use it. Anyway, i would love some feedback on it.

From the readme:

DESCRIPTION
The main purpose of this script is to be able to play a couple of mp3:s
easily on your roku soundbridge. The script will insert your mp3:s in
the firefly server database and then send commands to your sound bridge
to play the files. That means that you must be using firefly with sqlite3
and since it is a python script one must also have python installed. Check
out the python homepage at http://www.python.org. Note that the support
of m3u files is very limited, they can only contain a linebreak separated
list of mp3:s with relativ path.

Download here
http://lockecole.ath.cx/jop/playroku.zip

Note, since this script will edit your firefly db it has potential to screw things up. It has never done that to me, but be warned.