I just keep looking and looking and looking at this episode. The plot is cute and everyone's fantastic but OH MY GOODNESS THE BUTTONS ON the real Samantha's coat @ 1:45!! That green dress! That aqua chair @ 4:38! Total swoon.
Now with the rising popularity of Mad Men this particular aesthetic is starting to creep back into popularity (though it's always had its stalwarts). It's mid-century modern but the later edge of it (correct me if I'm wrong, design expert who might be reading this), less atomic and more 2001: A Space Odyssey (but a bit less "mod").
Here's the "Best of the Sixties/House Beautiful.
Modern Dig, a site with rare and collectible Mid-Century Modern Design books and objects.
TV Party! Classic television shows for those who obsess.
Twenty Five pieces of Retro Design Inspiration from Vectroave.
Retrospace, a well put together retro gamut blog (mainly 70's, but some 60's, too).
Ultraswank - Talks about old and new influence of sixties design here.
If you're looking for a more polished and professional inspiration source, The Mid Century Modernist is a sleek place to start. If you're just wanting to breeze casually through the era, and float onto green Astro-turf to your white wicker laced veranda, go to flickr and search "sixties" + "vintage" + "interior design" and you'll be treated to image collections from design lovers all over the world.