I’ve been a member of last.fm since 2006 and love it. I found this awesome ASP.Net user control that displays what I’m listening to. Of course I thought it’d be a nice fit to my theme. You can find the original post and download here at Chris Blankenship’s site.
You need to have an API key and an obviously an existing membership with last.fm but both are free. The user control allows you to display your latest track sin almost any fashion.