If your client only supports scrobbling to a single server it's now possible
to have Libre.fm forward your scrobbles on to Last.fm as they happen. Simply
click the "Edit" link on your profile page then "Connections to other
services" and connect up your last.fm account. Or click here:
http://alpha.libre.fm/user-connections.php (You must be logged in to
Libre.fm for this to work).