flattar.sh

#!/bin/bash
# usage: flattar.sh tarfile.tar
#
# doesn't gunzip files. You'll need to do that yourself first

tarfile=$1
shift
tar -tvf $tarfile | grep -v "^d" | awk {'print $6'} | while read filename
do
    tar "$@" -O -xf $tarfile $filename >${filename##*/}
done