Yes. In Simple XML, you can use the HTML panels type: http://docs.splunk.com/Documentation/Splunk/6.0/Viz/PanelreferenceforSimplifiedXML#html
Anyone have a clean way to do this where a a power user can click on something to edit the text without going to the source and modifying the HTML?
Yes. In Simple XML, you can use the HTML panels type: http://docs.splunk.com/Documentation/Splunk/6.0/Viz/PanelreferenceforSimplifiedXML#html
To include static html contend within a dashboard, you can use "StaticContentSample" module. Example below:-
<module name="StaticContentSample" layoutPanel="panel_row1_col1">
<param name="text"><![CDATA[
<h1>Header </h1>
<p>
Some text </p>
<p>
some other text </p>
<p>
blah blah </p>
]]>
</param>
</module>
If you are using Sideview Util, you can utilize "HTML" module for the same as follows:-
<module name="HTML" layoutPanel="viewHeader">
<param name="html">
<![CDATA[
<table cellpadding="0" cellspacing="0" style="width: 100%">
<tr>
<td><h2>Title</h2></td>
</tr>
<tr>
<td>This dashboard Does something </td>
</tr>
</table>
]]>
</param>
</module>