I don't usually plug stuff I'm being paid to run ads for, but I LOVE the designs over at Retropolis Transit Authority. Visually, these things are a dream come true -- literally, they are the future-dreaming of the 1930s-era scientifiction set.
My only regret is that I can't afford to buy swag for myself right now. (Okay, my REAL regret is that I didn't twig to this uchronic design years ago, and fill the Schlockiverse with it.)
Even if you're not shopping, go have a look at Bradley Schenck's work. It's gorgeous.