a word of advice though - fractals and 3d visualisers may *look* good but after 8hrs of the same old same old dont you think it is the visual equivalent of a dj playing the same tune with some very subtle remixes for 8hrs?
and in the same vein todays *psychedelic realtime visualisers* are tomorrows winamp plug-ins - there is nothing clever about a winamp plug-in on a big screen
best place to look and get feedback from people out there doing it
i use video loops and clips that are mainly *content* i.e. stuff that we have filmed or sampled and dont rely on 3d generated imagery
modul8 is good for that on the mac - another would be motion dive tojyo but i have seen a lot of criticism of that app recently