lm-sensors
and run sensors
.
mythtv: http://linpvr.org/
https://help.ubuntu.com/community/ViaEpiaDriHowto
http://sourceforge.net/docman/display_doc.php?docid=26963&group_id=102048
For the EK board, here's a tip to get fan control working: http://forums.viaarena.com/messageview.aspx?catid=28&threadid=75184&enterthread=y