Webdev:WAI-ARIA:Overview

Show Me the Money!

Before ARIA

 <div id="ads">
 ...
 </div>
 <div id="nav">
 <form id="searchform" ...>
 ...
 </form>
 ...
 </div>
 <div id="content">
 ...
 </div>

After ARIA

<div id="ads" role="banner">
...
</div>
<div id="nav" role="navigation">
    <form id="searchform" role="search" ...>
    ...
    </form>
...
</div>
<div id="content" role="main">
...
</div>