It's not a how-to or tips blog, or a blog that links to great stories. "Letters of Note" says it "is an attempt to gather and sort fascinating letters, postcards, telegrams, faxes, and memos.
So far, I've read one from a freed slave responding to his ex-master's job offer, and one from E.B. White responding to the ASPCA when it accused him of owning an unlicensed dog.
It's really interesting writing that you might not come across unless someone like Shaun Usher was finding and collecting them.