I've been looking for a list all WP_Query arguments.
This looks obvious, but http://codex.wordpress.org/Function_Reference/WP_Query isn't helpful at all, "post_type" is mentioned only in an example, and arguments like "posts_per_page" aren't even there.
WP_Querypage is purposely written in that way to detail the methods of the
query_postslists all the possible args for use with queries,
query_postsis just a wrapper/convenience function for the main
$wp_query->query()is also just a wrapper for the