This is a community wiki that asks the question, "Just how semantic can our HTML markup get thanks to HTML 5?" Below You can find the source code of a sample HTML 5 page. The object is to make a very usable, accessible, style-able webpage using as few classes and IDs as possible.
Also, when do you plan to start implementing HTML 5? Are you going to wait 10+ years until the draft is finalized, or are you going to be an "early adopter" now that browser support is rapidly growing?
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8" />
<title>Site Name • Page Title</title>
</head>
<body>
<nav>
<h1><a href="/">Site Name</a></h1>
<ul>
<li><a href="#">Nav Link</a></li>
<li><a href="#">Nav Link</a></li>
<li><a href="#">Nav Link</a></li>
</ul>
</nav>
<header>
<p>Welcome to the site!</p>
<a href="#">Call to action!</a>
</header>
<section>
<aside>
<!-- Sidebar -->
</aside>
<article>
<header>
<h2>Article Name</h2>
<p>Posted by <cite>Kerrick Long</cite> on <time datetime="2009-06-21">June 21</time>.</p>
</header>
<p>Lorem ipsum dolor sit amet...Aliquam erat volutpat.</p>
<figure>
<img src="/images/eclipse.jpg" width="640" height="480" alt="Solar Eclipse" />
<label>Here we can see the solar eclipse that happened <time datetime="2009-05-28">recently</time>.</label>
</figure>
<p>Lorem ipsum dolor...</p>
</article>
</section>
<footer>
<p>© <time datetime="2009-01-01">2009</time>, <cite>Site Owner</cite></p>
</footer>
</body>
</html>