I've just switched to a monospace font called Droid Sans Mono, a free,
Update: From the comments, Javier fact-checks my ass: "Sadly, it looks that Droid Sans is not Free after all, and anyone wanting to use a free-as-in-speech font of these characteristics has to pick between DejaVu (Bitstream Vera license, has italics, bold and almost every character under the Unicode sun) and Inconsolata (definitive version will be under SIL's Open Font License, prints pretty but is not so screen-pretty at small sizes, so far has no cursive or bold)."
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.