On Goldtoken it automatically selects the username field when the page comes up - i had a quick look at the source and it was a line of javascript:

<script language="JavaScript">
<!--
document.loginform.nickname.focus();
//-->
</script>

where "loginform" is the name of the form and "nickname" is the name of the textbox. With the HTML comments around it, it won't hurt people who don't have java enabled browsers, and will work for people who do.