actually using wp 3.3 beta...
think there is an issue with shortcodes... your plugin page says use:
[empty type='post']
for example... but that doesnt work... think there is some inconsistency...
in your shortcode processing, the default attribute is post_type instead of post... and after extracting, you pass a parameter of $type...
so think you should either change the attr to type or change the argument passed to your shortcode processing routine to post_type... have done the later and it makes the shortcodes start working...