Many themes call query_posts() one or more times, each overwriting the previous $wp_query object. Unless we're super careful, this can break a lot of stuff. To get back to the original query, I find myself doing
$GLOBALS['wp_query'] = $GLOBALS['wp_the_query'];
a lot.
I propose a new wp_reset_query() function that replaces $wp_query with the original $wp_the_query. It might prove useful to attach that function to the wp_footer action. It'd probably actually fix a lot of custom stuff out there that no one knew was broken, but it'd likely also break a few things for people.
Attached adds the function and no more.
