Thanks to iStartedSomething blog for these pictures and write-ups.

Microsoft Oxygen concept desktop system that converts from typical use mode, to media viewing, to pen input.

Microsoft Zinc concept intended for countertop use.

Microsoft Carbon concept micro PC with high object value.

Microsoft Argon concept entertainment biased all-in-one PC.

Microsoft Cobalt convertible notebook/tablet system.
All I can say is that they are gorgeous! Certainly give the old Mac a run for it's money in the cool stakes. I really hope the real things aren't to far of these examples.