Kindle
The most useful OS X utility on my machine has been LaunchBar, an application launcher that makes switching between apps and launching new apps very fast and convenient.
That's changed. Today, I downloaded QuickSilver, a beta app that does everything that LaunchBar does -- but more stylishly, faster and more intuitively -- and also includes a clipboard manager that lets me store the contents of the last 9 copy operations. It's also savvy to your iPhoto albums, your iTunes playlists, your addresss book and your Documents folder. I'm in love.
Link
(Thanks, Jeff!)
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.