Invisibility through metamaterials

Illusion Cloak Makes One Object Look like Another Object

Now this is cool, proper sci-fi turned sci-fact. I haven't yet researched what these near-magical "metamaterials" are, and I doubt they work in anything less than a strict structure -- so a "cloak" is out of the question, but a "screen" should be fine -- but it's all just bending light so who knows?

(Thanks to Shep for the link.)