Weburbanist has compiled an article about the history of beer cans, with some great photos of vintage packaging, including the first commercially produced beer in a can (pictured above).
American Can Co. began experimenting with canned beer in 1931, as it anticipated the end of Prohibition. Krueger’s Special Beer was the first commercially packaged beer in a can. The very first canned beer was sold in Richmond, Virginia in 1935. Early on, manufacturers were mostly concerned with creating a beer can that could hold up to the heat and pressure of the pasteurization process without bursting or later leaking on the store shelves. Style and branding were considered, but were not a top priority in the beginning. Pabst was the first major brewer to offer beer in a can.