Any way to have link_to_post be link_to_media_file instead ?

Nevermind ! I did it myself by adding the following to get-the-image.php:

/* If $link_to_media_file is set to true, link the image to its media_file. */
		if ( $this->args['link_to_media_file'] )
			$html = '<a href="' . wp_get_attachment_url( $this->args['post_id'] ) . '" title="' . esc_attr( get_post_field( 'post_title', $this->args['post_id'] ) ) . '">' . $html . '</a>';

Maybe you will find this useful in future releases of the plugin!

I just pushed some changes to the dev version here that handles linking to:

* post
* media file
* attachment page
* no link

See: https://github.com/justintadlock/get-the-image/commit/ded4e3634c2d8c8babd602a8e167dca776552a2b