Just so you folks realize, this isn't exactly a regular chip for everyday usage.
It has been specially built for usage in datacentres and cloud computing applns. You guys will probably have to wait for 2-3 years(atleast) before you get to see that many cores in your desktops.
Oh, and another thing.. these 48 cores aren't your regular cores like in a Nehalem or Core2Duo proccy.. these are basically 48 Atom cores.