It would sure be cool to be able to post sigs that contain these kinds of real time playlist viewer things. How come the forums can't support that?
<a href="http://www.last.fm/user/LostAmerica/?chartstyle=basicrt10"><img src="http://imagegen.last.fm/basicrt10/recenttracks/LostAmerica.gif" border="0" alt="LostAmerica's Profile Page" /></a>
From this site:
http://www.last.fm/tools/charts/