Windows Live's Double Rainbow
The fashionable thing to do these days, it seems, is to spoof internet memes. I can understand why; the hivemind of the interwebs is a powerful and formidable intellect.
Microsoft aren't ones to be left out of a party (don't mention Search) so it's not a surprise to see them joining in. No idea which agency to credit for this one. Drop a comment if you know.
I call this one - Windows Live all the way across the sky.