jwenl

This plugin provides support for using oEmbed in your WordPress blog.
Rick media Example: 
[oembed:http://polldaddy.com/oembed?url=http://answers.polldaddy.com/poll/2431815/&format=xml] 
This will put the selected polldady poll on your blog
Photo example Flickr: 
[oembed:http://www.flickr.com/services/oembed/?url=http://www.flickr.com/photos/23886028@N04/3983995799/in/set-72157622398187791/] 
This will put a Flickr photo into your posting.
Video example Youtube: 
[oembed:http://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=yvdbqcbRH50&format=json]

oEmbedder

This plugin provides support for using oEmbed in your Wordpress blog.

STN Video

The STN Video oEmbed plugin adds STN Video (formerly SendtoNews) as an oEmbed provider and adds it to the whitelist. This allows users to drop oEmbed links from STN Video into their WordPress posts to add video to their posts.

STN Video oEmbed

This plugin adds oEmbed support for STN Video videos by registering STN Video as a provider.

oEmbedder vs STN Video oEmbed