inserting youtube videos into blogs (wordpress) & Audio

This for the newer versions of Wordpress

wordpress player can be embedded in a post using a tag of the following
form: [youtube:URL] e.g. [youtube:http://www.youtube.com/watch?v=Jb1_h9bguvI]
You simply insert that whole line (including the [ ]) into your post where ever you want the video to show up.
The URL is the url found on YouTube for a particular video.
You can also set the dimensions: [youtube:URL WIDTH HEIGHT]
e.g. [youtube:http://www.youtube.com/watch?v=Jb1_h9bguvI 300 200]

Inserting Audio

the same strategy can be used to insert a player that will play a mp3 or audio file.
[audio http://www.nameofsite.com/audio.mp3]