The only way I'd really like to see a spell checker on this (or any other programming site) would be if it ignored anything between code segments. Otherwise, you'd have to scroll through countless "mispellings" to post it. Not to mention the longer the posted script (really, what spell checker is going to know $_ unless it's added manually?) the more time the server would take trying to parse supposed errors.
If it excluded code blocks, it'd be okay, though. I usually try to check myself during preview anyway.
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Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<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>
<td> <th> <tr> <tt>
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 How to display code and escape characters
are good places to start.