No Duplicate Posts across Multiple Queries http://wordpress.org/support/topic/how-to-add-four-wp-queries-without-duplicate-posts

No Duplicate Posts across Multiple Queries

http://wordpress.org/support/topic/how-to-add-four-wp-queries-without-duplicate-posts

query for loop1
loop1:
$do_not_duplicate[] = $post->ID;
end loop1;

query for loop2 including 'post__not_in => $do_not_duplicate'
loop2:
$do_not_duplicate[] = $post->ID;
end loop2;

query for loop3 including 'post__not_in => $do_not_duplicate'
loop3:
$do_not_duplicate[] = $post->ID;
end loop3;

query for loop4 including 'post__not_in => $do_not_duplicate'
loop4:
end loop4;