Most WP plugins are pretty easy to use. Still, there are always those that bring up some trouble along the way.

WP plugin: Flash MP3 player I cannot point directly to the post, but [EDIT] Link fixed. (T)his plugin makes any mp3 links (in post or page or any other location in your blog) playable directly on your webpage. In addition, your visitors will have the opportunity to easily tag and post the mp3 link to del.icio.us. This script is extremely lightweight, as is the flash movie that plays on demand. Must-have for podcasters or anyone who wants to allow blog visitors to play mp3 files on the website itself. [Read the rest]