I've just ordered a DVD-t card (Hauppage Nova-t) from dabs and hope to run it under Debian GNU/Linux although I'm not sure where to start - I've dowloaded the linux drivers but not sure how to watch channels in X.Try mplayer http://www.mplayerhq.hu/ and dvbstream CVS ( http://www.linuxstb.org/dvbstream/ ).
MPlayer ( http://www.mplayerhq.hu/ ) is pretty good in dealing with rtp or http MPEG2 streams on both Unix and Windows (cygwin).What I have found to be a problem is finding players that will listen to boradcasted MPEG2 streams. It seems to stem from the fact there are a lot of methods to do this (from dvbstream to videolan etc), and each seem to use different methods of sending the data. So I've yet to come across one that can both send the data mutlicast, and have a windows player and unix player access the stream.