R2-D2 Collects Mail?

Crazy but true. R2-D2 mail boxes will be introduced in 200 cities to commemorate a new stamp. It even has Lucas' web address on it. Free advertisement is a wonderful thing. Even though it looks pretty neat, I'm not sure if its ethical. Why should Lucas Fims get free advertizing? I believe they are paying for the wrapping but who's paying for the ad space on government property? A better question is, how many lawsuits will this generate from other movie companies?

Oh yeah and happy belated ST Paddy's day.