Here is a mind map embedded into a post
Embedding a Mind Map
taghelp
Uploading versus embedding
Here is what it looks like when you add a video from your desktop
Here is what it looks like when you embed a video from a storage site such as Youtube
Protected: Post: adding a Ppt on Edublogs
How tags can help you
Here is a quick video that shows how you can use the reader to find tagged posts.
Hope it helps!