Well you couldnt really escape them, they appear on many of the websites I visit. The ad's come in three sizes. Tall narrow 120px wide 600px high, Tall fat 160px wide 600px ad's and squareish 300px wide 250px high. I dont know how many T-Shirts they sell but given the frequency that the ad's appear I assume enough to keep doing it. Of course it helps that the T-Shirts have some clever slogans on them. It also helps that they have some attractive girls to model them. These are some of my favourites: