This is my continuous tail script. It's good to have running on another screen while you are working on PHP code. You can ct the apache error_log and watch the log as the page is accessed. Streamlines the whole debugging thing.

#/bin/sh
if [[ "$1" == "" ]]
then 
    echo "Continuous Tail Script (50 Lines, 5s Interval). Tim 10/09/2007"
    echo "Usage: ct [file]"
else
    clear
    tail -n 50 -s 5 -f $1 
fi