I'm using a xinerama setup with an with the tv-out
( xineramascreen 1 ) being the upper left quadrant of my desktop
( crt, xineramascreen 0 ).
in mplayer, i can specify the xineramascreen using the command line
mplayer -xineramascreen 0 file.avi
and when i press "f" for fullscreen, mplayer maximizes to the
specified screen. this is very useful, since otherwise I'd have to
manually resize the movie window until it "somehow" fits the tv ....
debian sid / unstable
nvidia geforce 5700 with 61.11 drivers from nvidia.com
kplayer .deb package from the sourceforge apt source