Cacher is the code snippet organizer for pro developers

<?php

/**
 * gets the current post type in the WordPress Admin
 */
function get_current_post_type() {
	global $post, $typenow, $current_screen;

 	//we have a post so we can just get the post type from that
 	if ( $post && $post->post_type )
		return $post->post_type;

 	//check the global $typenow - set in admin.php
 	elseif( $typenow )
		return $typenow;

	//check the global $current_screen object - set in sceen.php
	elseif( $current_screen && $current_screen->post_type )
		return $current_screen->post_type;

	//lastly check the post_type querystring
	elseif( isset( $_REQUEST['post_type'] ) )
		return sanitize_key( $_REQUEST['post_type'] );

	//we do not know the post type!
	return null;
}
echo "<pre>" ; var_dump(get_current_post_type()) ; echo "</pre>";
?>