Ah, I see I did misunderstand. My appologies
Yes, we should definitely take advantage of labeling the existing container classes. The issue I see is popping open the source code to the page is that these container classes aren't implemented as containers. There just a few table cells here and there. Nodelets aren't even their own tables, but rather table rows in the larger table. I'd love to see something like:
<div id="main" >
<div id="node_content">
</div>
<div id="node_replies">
...
</div>
</div>
<div id="sidebar">
<div id="nodelet_xp">
</div>
<div id="nodelet_chatterbox">
</div>
...
</div>