You can embed PDF files, objects with [iframe src="http://vimeo.com/123" width="100%" height="480"] shortcode. Objects like mp3 players, video players.

Pageflow Embeds is a plugin to easily embed Pageflow stories into wordpress based websites.

Please refer to codex.wordpress.org/Managing_Plugins#Automatic_Plugin_Installation.

With this plugin you can place an iframe inside the TinyMCE text editor.