<p>What is the <a href="http://en.wikipedia.org/wiki/MIME" rel="noreferrer">MIME</a> type of javascript? </p>

<p>More specifically, what is the right thing to put in the "type" attribute of a script tag? <code>application/x-javascript</code> and <code>text/javascript</code> seem to be the main contenders.</p>

In a script tag I would use text/javascript.   This appears in the HTML 4.0 specification, anyway.
http://www.w3.org/TR/REC-html40/interact/scripts.html
[EDIT] Funny how the
RFC
that standardized on application/javascript is 2 years old, but text/javascript is still more common.  Is this yet another case of custom triumphing over standards?  It also appears in
HTML5
.