Similiar to a youtube, or img tag. You put [mp3]http://urlofmp3.mp3[/mp3] I've seen it on a couple other vbulletin forums. It puts a little player in the post, you click on play, and it starts playing, it has a little seek bar as well. I think it's flash based, but I'm not sure. It would be cool to have something like that. Makes it really easy just to post a little voice clip in a thread or something, without the person having to click to download. If you would like brix, I can find an example of what I'm talking about I haven't explained myself quite well.