There are rumours running around that Viacom is expected to buy Last.fm for 450 million USD. Mashable reports on a DealBreaker.com rumour that Viacom is chucking in an offer for the “YouTube” of music.

Looks interesting – especially as this will be one of the first large web2.0 music capitalisations. Furthermore, there might be something happening as Joi is in SF for a day and AFAIK he’s on the board of last.fm.