Letters of note is is an attempt to gather and sort fascinating letters, postcards, telegrams, faxes, and memos. That means billets doux from Monica Lewinsky to Bill Clinton, a plea by a mother to Myra Hindley to make a full confession (it worked), inspirational replies to fan mail, even letters to Stalag Luft prisoners in the Second World War. Get stuck in. It's the most interesting thing I've seen in ages (spotted by Ben Hammertown).
(if you're viewing this feed on Facebook, click "view original link" to see it in all its Dysonology glory)
PS - Be sure to ferret out the Oscar Wilde letter, in which he justifies his claim that 'all art is useless'.