I much prefer serifs, particularly in the context of code and the like, wherein the ability to quickly and easily discern the difference between the numeral one (1), the lowercase L (l), and the pipe (|) is of particular importance. In most prose text, the pipe character isn't even present, and there is almost always sufficient context to quickly discern a numeral from a letter, but in code, these concerns are EXTREMELY relevant.
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).
Not an editor command: Wq
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<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
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Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
Want more info? How to link or
or How to display code and escape characters
are good places to start.