Ugh, Courier. Courier New. So fancy. They have all the dangling lines and fancy curves, it becomes a bear to read, especially at the small font sizes required to fit 90 lines of code on a screen. Trust me, try Lucida Console. It's a fixed width font (which should be a requirement for all code), but it's much smoother, with purer curves and more readable design. It's like coding in a modern font like Arial without the proportional nature.