--- style.css
+++ (clipboard)
@@ -179,10 +179,15 @@
   height: 4em; /* Be sure to adjust the margin below to match */
 }
 
+#navigation .section h2 {
+  display: none; /* See: http://drupal.org/node/995986 */
+}
+
 .with-navigation #content,
 .with-navigation #sidebar-first,
 .with-navigation #sidebar-second {
   margin-top: 4em; /* Be sure to adjust the height above to match */
+  clear: both;
 }
 
 #highlighted {
@@ -224,6 +229,12 @@
   padding-right: 230px;
 }
 
+.sidebar-first #content .section,
+.sidebar-second #content .section,
+.two-sidebars #content .section {
+  clear: both;
+}
+
 #footer {
   border-top: 1px solid #ccc;
   padding: 1em 1.5em;