Just curious, are your tracks scrobbled when you play them through media center? I thought I’d heard this was the case with MCE 2005 because it was using the windows media player plugin. Haven’t heard if the same is true or not with Vista. Also, wondering how this works with extenders.
I’ve also been looking for a plugin to play Last.fm from within media center, but the only one I know of, LastFMCE, is on SourceForge and I don’t know what to do with it to be able to use it.