Useful links:-
http://forum.geomancy.net/phpforum/article.php?bid=2&fid=1&mid=29281&new=
http://forum.geomancy.net/phpforum/article.php?bid=2&fid=6&mid=29335&new=
http://forum.geomancy.net/phpforum/article.php?bid=2&fid=6&mid=29137&new=