I guess I'm in good company. Recently in Slate, they asked a selection of writers their favourite fonts. And Jonathan Lethem (writer of Fortress of Solitude) says:
"Before computers, I wrote three novels on a typewriter, and there can never be anything but 12-point Courier (double-spaced) forever..."It seems that Courier, and its sibling Courier New, remain the font of choice for writers, but other fonts get some loving too. Palatino, Times, Hoefler Text... all good fonts too, but not what I would use to compose my magnum opus.