in reply to My preference on serifs:
Also, for what it's worth, more serif fonts than sans-serif fonts contain a numeral 0 which is easy to discern from a capital letter O. That, and any font I use for code has got to be monospaced, which is a limitation that yields a higher portion of serif fonts, as well.
Of course, the need to display code well covers almost every general purpose text application I use, since, being a programmer, almost any general purpose text application is likely to end up containing code (email, IM, text editing, terminal consoles, etc).
------------ :Wq Not an editor command: Wq