The font in question is a commercial font called Phenix American. It is
also sometime referred to as CGPhenixAmerican. From a message group post.
"The main Got Milk? font is Phenix American ..."
There is a really neat program on the MyFont called WhatTheFont that tries
to figure out fonts for you, and the "Got Milk?" font is an example.
"Ever wanted to have a font just like the one used by certain publications,
corporations, or ad campaigns? Well now you can, using the WhatTheFont font
The WhatTheFont program identifies the font as Phenix American. It also
gives some alternative fonts as well.
Phenix American is available for purchase from the Fonts.com web site.
"Phenix American ... $22.00"
If that is too pricey for you, there is a font named Borzoi which resembles
Phenix American. You can download it from sites such as Sharkshock.
"Font name- Borzoi resembles- Got milk? font"
If you need any clarification, feel free to ask.
Google search on: "got milk?" font
Google search on: "Phenix American"
Google search on: CGPhenixAmerican
Looking Forward, denco-ga - Google Answers Researcher