It seems that wordpress plugin directory list many of plugins twice (or may be more). this makes it slightly time consuming and also doesnt look nice.
here are example from search (as on today, sort by relevence)
WordPress Dashboard Twitter , this plugin is listed on
http://wordpress.org/extend/plugins/search.php/page/3?q=twitter&sort= at first position
and on http://wordpress.org/extend/plugins/search.php/page/2?q=twitter&sort= at second last position.
similarly "Simple Twitter Data" listed twice on 3rd and 4th page using same search.
A little improvement in directory search result would enhance user esperience