The tranquils come with Squeezecenter pre-installed - http://www.tranquilpc-shop.co.uk/acatalog/Music_Servers.html. They are using atoms now. As for dual core atoms, it think it would be overkill for most Squeezecenter users, but would provide an extra level of future proofing i guess. I'm seriously thinking of getting one now. There is a way of doing that already with Squeezeserver.