Letterheady is a great website run by Shaun Usher showcasing interesting letterhead designs, mainly it seems from famous people, offices and corporations. Shaun describes it as, "an online homage to offline correspondence; specifically letters. However, here at Letterheady we don't care about the letter's content. Just its design." What a wonderful resource for ephemera geeks and designers.
There's a good range too- some of the designs are simple and to the point whilst others like the Barnum's one (above) are fantastically elaborate. Here are my favourites:
Images copyright Letterheady.
Via our friends at Sell! Sell!