Reese's are made by Hershey – see our separate section for some of their other lovely stuff – but are worthy of a section of their own.  It's the best-selling confectionery brand in the USA, perhaps most notable over here for being a favourite of E.T. the Extra-Terrestrial (thus paving the way for all of the shoe-horned product placement we get on TV today).  The first Reese's Peanut Butter Cup was launched in 1928 – centenary coming up!