seanbdurkin

I recommend against using this plugin with the WordPress Visual Editor, as I have not tested it with the visual editor, and will not support the use of the plugin through the Visual Editor.
Nice features of SBD Aside include:
<ul>
<li>HTML 5 Support. SBD Aside uses the HTML 5 semantic tag <a href="http://html5doctor.com/aside-revisited/" title="Aside element" rel="nofollow ugc"><code><aside></code></a> to play well with search engines and content aggregators.</li>
<li>Choose left or right placement on the page.</li>
<li>Choose expanded (“open”) style, or collapsible.</li>
<li>collapsible ones like on the top right of this page can be collapsed or expanded by the reader as required.</li>
<li>Choose round corners or square cut.</li>
<li>Choose background colour.</li>
<li>Choose width in pixels or percent.</li>
<li>Choose from one of two caption underline styles.</li>
<li>Display a caption</li>
<li>All of the above options/settings are optional. Define your own defaults in the plugin’s setting page.</li>
<li>The styling for the aside is compact, with a small font and low margins. This minimises space disruption to the main article.</li>
</ul>

SBD Aside

The SBD Aside plugin is a WordPress plugin that allows bloggers to easily create small side-bars for there entries, called asides.

Daniel Iser

With many HTML5 themes out now users will need more control over their widgets to take full advantage of the new HTML5 Semantics. This plugin allows you to change the DIV/Container element of each widget to one of the new HTML5 Semantic tags.
<h4>Tags Available</h4>
<ul>
<li>Aside</li>
<li>Section</li>
<li>Nav</li>
</ul>
If you like the plugin please rate it.
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HTML5 Widgets

This plugin allows you to change the DIV/Container element of each widget to one of the new HTML5 Semantic tags.

SBD Aside vs HTML5 Widgets