Is Courier New just not doing it for you anymore? This page summarizes and rates different fixed-width fonts based on their suitability for use in a programming environment. The reviewer evaluates several factors including how easily the characters 'l', '1', and 'i' are distinguised, as well as the characters '0', 'o', and 'O'. After browsing several of the handy font previews, simply follow the associated link to download your new favorite programming font. The top-rated font, Bitstream Sans Vera Mono, looks great without ClearType and awful with it, so if you have font smoothing enabled, I recommend you look further down the list for something that plays better with ClearType