based on following information (http://sourceforge.net/mailarchive/forum.php?thread_name=200804010427.m314RNYV022726%40localhost.localdomain&forum_name=mvpmc-devel), Jon Gettler is developing a MythTV client for the PopCorn Hour NMT.
As far as I have seen he already get's an ouput on the screen, not only a basic OSD but also some video.
I have looked into the code repository shortly and it seems to use directfb. Also some opcodes are used, but I didn't investigate too much.
Can this code be used for the X30xT as well to get output on the screen?
in theory yes, but we still have a problem with loading the uCodes (which is the firmware of the hardware audio/video processor).
without the uCodes it is not possible to open a graphical output.