Graphic Design from the 1920s and 1930s in Travel Ephemera. Amazing collection of posters, road maps, steamship and airline timetables, (more timetables here), post cards, luggage labels (more labels here and here), brochures and more. Seeing this stuff makes me wish I had been born seventy-five years earlier (and with an obscene amount of money.) (Warning: the site is seriously painful to look at, but the content's good. Link via Coudal.)
What time was my flight? This is a collection of flight timetables through the ages from a large variety of countries - it also serves as a rather nice library of graphic deisgn from around the world. There are some nice links on the front page too.