I use a neat little hack for older browsers to see the newer html5 tags (It works pretty good for the most part).
In your css stylesheet put this at the top.
body, header, hgroup, nav, article, section, footer {
display: block;
}
Then I created a javascript, (actually I use an external file and I know I am missing some tags(elements))
<!--[if lt IE 9]>
<script type="text/javascript"> document.createElement('header');
document.createElement('section');
document.createElement('nav');
document.createElement('aside');
document.createElement('article');
document.createElement('footer');
document.createElement('hgroup');
</script>
<![endif]-->
There's even external javascript scripts on the web that do the same thing (maybe even a little better); however, I having tested this with IETester and for the most part it does a pretty good job.
John