If you love cupcake, you must know Magnolia Bakery in New York. This is probably one of the most succesful cupcake cafe on earth - there's usually a line waiting to get in at late night, and the business is so good that they have to set a purchase limit for all cuctomer (i think its 12 pcs max).
I have never been there... I may one day... I hope. For now, I shall be contented watching, in awe, their superb frosting skills!