The configuration of X didn't go all that smoothly, but mainly because my TV didn't support S-Video all the way. ;)
Gotta buy a new display device (Projector/TV/Plasma-TV)... (I have a nice vision of having MythTV automatically boot up on :0 and GDM on :1 when I have a video-output device that has descent contrast..)
Nonetheless, I've put up my xorg.conf for viewing. Actually, it's a xorg.conf I found on asusfan.linux-site.net and modified (mainly for Composite).
I tried (in vain) to get DRI working, but I found a source somewhere saying that it's impossible with the SiS chipset that comes with the DiGiMatrix. If something changes, or if someone gets it to work, I'd be happy to know about it.
Well, not much more to say about this right now, since I've already covered my X-startup.