MPlayer vs. XScreensaver
Are you sick of the screensaver kicking in at all the wrong times while watching a video with mplayer in full screen? The mouse doesn't work. The now-not-fullscreen window is all distorted. Sometimes the keyboard is unresponsive until you type the magic incantation (hint: alt-tab). Well I'd had enough.
Just to show how lazy I was, the answer is right in the manpage. You just need
to specify the -stop-xscreensaver option. But that's a pain, so what you
really want to do is this:
mkdir -p ~/.mplayer
echo "stop-xscreensaver=yes" >> ~/.mplayer/config