I saw those last time I went through LAX...I think they were brought to you by the same geniuses that thought up the idea of ads on the little dividers that go between your groceries and the next guy's on the belt, or the ads over urinals. After all, it's just another place where we have to stand around for a few (or more) minutes, so we have time to read an ad, right? My first thought was, "that's annoying", and my second was, "but OTOH, that's clever".