I've used xautolock with great success.  It works with xlock and
xscreensaver.  Here's a line from my $HOME/.fvwmrc file:

# automatically lock screen after 15 minutes of inactivity 
# using matrix screen saver
Exec    "I"     exec /usr/X11R6/bin/xautolock -time 15 -locker \
	"/usr/X11R6/bin/xlock -mode matrix" &

http://freshmeat.net/projects/xautolock/

For consoles (eg, text mode) I use 'vlock -a'.

Jared Burns wrote:
> Does anyone know how to configure a machine such that all users must have a 
> screensaver password? For security purposes, I want to turn on screensaver 
> passwords as root.
> 
> Thanks,
> - Jared
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-- 
-scot