I don't know how, who, when or what made me aware of Letters of Note. What I do know is that I get a lot of pleasure from the site. It is a collection of correspondence that I find to be quite interesting. Some of them are letters from celebrities and some of them are from people that are interesting for other reasons- such as the one the Kamikaze pilot wrote during WWII.
It has become a daily stop for me. Check it out.