Easily the best piece of guerrilla marketing of CES comes from Seal Shield. These "splash mats" were placed in the urinals near the press room in the Venetian Hotel.
Hundreds of reporters must have looked at them (eyes down is the no 1 rule in men's urinals) and read "Your keyboard has 400 times the bacteria than this urinal." Apparently Seal Shield makes dishwasherproof keyboards and remote controls.
Thanks to Matt of techwarelabs.com for taking the pic (while holding his nose). I should point out that this splash mat was retreived by the attendent wearing disposable gloves, thoroughly washed and dried before the picture was taken. As you can imagine, strolling into the men's toilets with a camera would not have been a good idea.