Also known as a "California Common" beer, the steam beer is a true red-white-and-blue American beer (not to be confused with those bearing enormous advertising budgets.) Invented in the late 1800's during a great migration of settlers to the American west, it's unique in that it was intended to be a lager that had to be fermented at higher temperatures due to the lack of access to ice and refrigeration. Therefore, the steam beer is a fruitier and maltier beer than a true lager but still has a good bit of bitterness and a clean finish. The most famous California Common/steam beer is the Anchor Steam beer made by Anchor Brewing Co. in San Francisco (which carries the trademark for the term "steam beer.")
Cream Ales are similar in that they're also an ale/lager hybrid of sorts. Depending on the brewery, they're made with various ingredients, fermentation techniques in order to produce this ale that is similar to a lager with a clean finish and high-carbonation. Corn-like malt with a touch of sweetness and some bitterness are expected; this is a true "lawnmower beer."