According to DealBreaker.com, Last.fm might be sold to Viacom. If so, this would be some huge news. I saw Last.fm present at the Future of Web Apps and they definitely were pitching themselves as a valuable service to record labels. Apparently, the attention data that they are storing in regards to user’s music listening habits is worth $450 million. To be honest, I’m not quite sure that $450 million would be enough, considering that MySpace sold for more than $550 million if my memory serves me correctly. Either way, Last.fm is a prime takeover target for any large record label. If the rumor is wrong this time, I’m sure that we will see it happen sometime soon.