Anybody who is a fan of written correspondence, graphic design or just good old nostalgia must check out Letterheady.
From 1969 - Look at the font! God i love the 1960s!
Described as being overcome by emotion due to a letterhead design, Letterheady is the work of Shaun Usher who describes the blog as an online homage to offline correspondence; specifically letters. Even more specifically, their design, not content.
The Cola Wars alive and well pre-war!
If you're into the content side of things, Shaun has a sister site Letters of Note worth checking out.
Personally, i love the Frank J. Walter Circus letterhead - distilling the essence of P.T Barnum and the charm of the most charming of story books.