I have never been a big fan of the System font we have had in the old Clarion IDE. Some time ago I stumbled on the Droid Sans Mono font from Google. I really like it. It's readable and clear. I have installed it on several virtual machines for both Clarion 6 and Clarion 8 as well as my external editor. If you want to try it you can download it from http://www.fontsquirrel.com/fonts/Droid-Sans-Mono and install it. To install it, right click on the .ttf file and select "Install" from the popup menu. The old Clarion IDE doesn't pick it up right away, think it may need a reboot, but you can force it to use it by close Clarion and then edit the [editor] section of C60EE.ini or C60PE.ini. This is the entries I have in mine:
font=Droid Sans Mono
That's it. Here is a small sample of of the Droid Sans Mono:
If you don't like it, you can always change back to Courier New which was what I was mostly using before, or any other mono-space font. If you have information about good mono-spaced fonts that work well with code editors, I would appreciate if you post a comment with your favourite font!