This takes an avi or mpg and somehow renders it on the fly and out to the ieee so that you can watch it on your external monitor. Seems to work well on my old 1.4 TBird.
http://icqphone.ru/video2tv/
"If You wish to watch your movies (DivX, mpeg, etc.) on TV, but You don't have TV-out, You can do it if You have miniDV camera or MiroVideoDC30+ card.
Just make connection PC(1394) -- miniDVcamera -- TV or MiroVideoDC30 -- TV and watch any Your movies on TV."