HTML5 (the new version of html) has a number of new features, and one of those features is that there is a new type of input that is basically the same as the normal input field (like the one you use to write your title when you ask a question on SE) accept that when you start typing a little x appears on the right of the form. When you click that x, the form clears itself. The html code for it is
<input name="q" type="search"> (it's only supported in webkit browsers). See this page for more information: http://diveintohtml5.info/forms.html
Right now I am wondering if there are any usability benefits to having a input field like that, besides the fact that apple does it in itunes and some of it's other applications. Personally, it seems like a waste of time for it to be included in the html5 specification, since it doesn't seem like it's that big of a deal.