Today from Pixelistes - card # 6 with "I am sexy" on the back (click on image for larger view):
The good news is that this appears to be a Nikon campaign, the bad news is that it could be Coolpix related.
This is an ad from a UK newspaper with same "I am ..." slogan:
The colors on the cards look similar to the different Coolpix colors:
Since there won't be any Coolpix announcement until August, the information I received points that this countdown is for a new Web 2.0 website (read on Wikipedia about Web 2.0).