Exhibit A: Jeff Greenwald tells the story of meeting Arthur C. Clarke. It's riveting radio with a most delightful story. And the catalyst behind it all is a simple letter.
Exhibit B: Want to have political influence? I mean, really be heard by a politician? Turns out, you don't need technology or money, what you need is the simple letter (well, probably lots of letters, but still).
At first glance, it's a crazy notion, but listening to Omar Ahmed's TED talk, it makes perfect sense. Letters are hard to ignore and carry a special sort of weight.
Makes me want to go out and buy a book of stamps.