Plug-in to allow iframes to be added to blog posts and site pages:

(ie: Allows you to post a streaming player on Wordpress)

Here is a plug-in for Wordpress which will allow iframes to be added to blog posts 
and site pages. For example, if you want to post a streaming player on Wordpress, 
this will allow you to do so. It also allows you to use the new Youtube and Vimeo 
embeds. NOTE: It does open you up to potential security issues if you paste 
foreign iframes into your pages.

Code with:

http://pastie.org/2247034