In the interest of conserving my dwindling shelf space, will I be able to buy them as e-books?

This is pretty exciting. I love the 33 1/3 series, through which I've gained a deeper appreciation of albums I already like, and discovered some great insights about albums (and artists) I had passing interest in. Reading about different movies (some I might love, some I might just be curious about) sounds similarly intriguing...

Have you seen the Pocket Essentials series? Similar idea from a British publisher about a variety of topics including film:

http://en.wikipedia.org/wiki/Pocket_Esse…

There's also the BFI Film Classics series:
http://us.macmillan.com/series/BFIFilmCl…
"The Manchurian Candidate," by Greil Marcus, is particularly exquisite.