f.lux has been updated to a new version
I use f.lux all the time (on OS X). The only thing that frustrates me about it, is that "disable for an hour" actually means "use daytime settings for an hour". I reduced the daytime temperature to 4500K, but when I need to do graphical work, I want flux to disable completely. And yes, I know, I can simply quit the app, but then I forget to re-enable it.