Here's a couple of scripts for saving Youtube Flash Videos to your hard drive

#!/bin/bash
#
# FLASHCOPY
#
# Will ieterate through all open copies flashplayer and copy flash video to the
# current folder (or specified directory) with the .flv extension added.
#
# USAGE:
#     flashcopy .  (copy to current directory)
#     flashcopy ~/Videos  (copying to a specified directory)
#
# This is done by finding all running copies of the flash player and looking at
# what files are opened by the process. If the file is a /tmp/Flash file 
# it is copied

args=("$@")

args=`echo $args | sed 's/[/]$//'`

pids=`eval pgrep -f flashplayer`
for pid in $pids
do
        lsoutput=$(lsof -p $pid | grep '/tmp/Flash[^ ]*')

        IFS=$'n'
        for line in $lsoutput; do
        lsout1=`echo $line | awk '{print "/proc/" $2 "/fd/" $4}' | sed 's/[rwu]$//'`
        lsout2=`echo $line | awk '{print $9}' | awk -F '/' '{print $3}'`

        if [ -n "$args" ];then
        if [ -d $args ]; then
        echo "Copying $lsout2 to $args/"
        eval "cp $lsout1 $args/$lsout2.flv"
        else
        echo "The directory "$args" doesn't exist"
        break
        fi
        else
        echo "Copying $lsout2"
        eval "cp $lsout1 $lsout2.flv"
        fi
        done  

done