Think Apple's MacBook Air is one overpriced ultraportable? Have a gander at the build sheet for Sony's refreshed VAIO Z. The same machine that we took a peek at this February has seen a predictable fall update, right alongside legions of other Sony lappies. The 13.3-inch machine can now be ordered with a presumably lap-melting Core i5-460M (2.53GHz), Core i5-580M (2.66GHz) or Core i7-640M (2.8GHz), an optional carbon fiber colored cas
