http://txfx.net/code/wordpress/enforce-www-preference/
About
This plugin will help preserve your permalinks by enforcing your no-www or yes-www preference (
http://example.com/ vs.
http://www.example.com/) and will strip off index.php from the ends of URIs.
http://www.prelovac.com/vladimir/wor.../smart-youtube
Smart Youtube is a WordPress Youtube plugin that allows you to easily insert Youtube videos/playlists into your post, comments and in your RSS feed. The plugin is designed to be small and fast and not use any external resources.
http://wordpress.org/extend/plugins/umapper/
The UMapper plugin is a universal mapping platform that makes it a snap to create engaging maps and add them to your blog posts. Microsoft Virtual Earth, Google Maps, Yahoo and OpenStreet are all supported by this truly universal plugin.
http://sharethis.com/