So you we're looking for the RSS Feed of Last.fm, and then discovered they were gone!
Well, the solution is right here, all you have to do is tell me your username and i'll give you four URLs,
one for you recent tracks, one for your loved ones, one for your top tracks and one for your top artists (the last two with an optional period, defaults to 1 month).
also new: images! if last.fm adds something other than a default image, it's large version is added as an enclosure