Moving elements to other page regions
I will again answer my own question here:

The change is made in the page.tpl.php template found the the template directory of your theme.

In this case, all I had to do is move the following:

&lt;?php if ($breadcrumb): ?&gt;
  &lt;div id="breadcrumb"&gt;&lt;?php print $breadcrumb; ?&gt;&lt;/div&gt;
&lt;?php endif; ?&gt;


from it's present location under the main-wrapper to its new location under the content heading. Then I cleared the theme registry cache.

Make sure that if you move an "if" statement, that you always move its corresponding "endif" statement too.

:)