do some trickery to get borders looking right

bootstrap.css

@@ -6,7 +6,7 @@
  * http://www.apache.org/licenses/LICENSE-2.0
  *
  * Designed and built with all the love in the world @twitter by @mdo and @fat.
- * Date: Sun Jan 15 21:49:43 PST 2012
+ * Date: Sun Jan 15 21:54:32 PST 2012
  */
 html, body {
   margin: 0;
@@ -2942,14 +2942,17 @@ a.thumbnail:hover {
 .accordion-heading {
   padding: 5px 10px;
   border: 1px solid #ddd;
+  border-bottom: 0;
 }
 .accordion-body {
+  border-bottom: 1px solid #ddd;
   margin: 0 0 1px 0;
 }
 .accordion-inner {
   padding: 10px;
   border: 1px solid #ddd;
-  border-top: 0;
+  border-bottom: 0;
+  margin-bottom: 0;
 }
 .accordion .in {
   margin-bottom: 9px;

bootstrap.min.css

@@ -514,9 +514,9 @@ a.thumbnail:hover{border-color:#0088cc;-webkit-box-shadow:0 1px 4px rgba(0, 105,
 .progress.info .bar{background-color:#339bb9;background-image:-khtml-gradient(linear, left top, left bottom, from(#5bc0de), to(#339bb9));background-image:-moz-linear-gradient(top, #5bc0de, #339bb9);background-image:-ms-linear-gradient(top, #5bc0de, #339bb9);background-image:-webkit-gradient(linear, left top, left bottom, color-stop(0%, #5bc0de), color-stop(100%, #339bb9));background-image:-webkit-linear-gradient(top, #5bc0de, #339bb9);background-image:-o-linear-gradient(top, #5bc0de, #339bb9);background-image:linear-gradient(top, #5bc0de, #339bb9);background-repeat:repeat-x;filter:progid:DXImageTransform.Microsoft.gradient(startColorstr='#5bc0de', endColorstr='#339bb9', GradientType=0);}
 .progress.info.striped .bar{background-color:#5bc0de;background-image:-webkit-gradient(linear, 0 100%, 100% 0, color-stop(0.25, rgba(255, 255, 255, 0.15)), color-stop(0.25, transparent), color-stop(0.5, transparent), color-stop(0.5, rgba(255, 255, 255, 0.15)), color-stop(0.75, rgba(255, 255, 255, 0.15)), color-stop(0.75, transparent), to(transparent));background-image:-webkit-linear-gradient(-45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);background-image:-moz-linear-gradient(-45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);background-image:-ms-linear-gradient(-45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);background-image:-o-linear-gradient(-45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);background-image:linear-gradient(-45deg, rgba(255, 255, 255, 0.15) 25%, transparent 25%, transparent 50%, rgba(255, 255, 255, 0.15) 50%, rgba(255, 255, 255, 0.15) 75%, transparent 75%, transparent);}
 .accordion{padding:0;}
-.accordion-heading{padding:5px 10px;border:1px solid #ddd;}
-.accordion-body{margin:0 0 1px 0;}
-.accordion-inner{padding:10px;border:1px solid #ddd;border-top:0;}
+.accordion-heading{padding:5px 10px;border:1px solid #ddd;border-bottom:0;}
+.accordion-body{border-bottom:1px solid #ddd;margin:0 0 1px 0;}
+.accordion-inner{padding:10px;border:1px solid #ddd;border-bottom:0;margin-bottom:0;}
 .accordion .in{margin-bottom:9px;}
 .carousel{position:relative;line-height:1;}
 .carousel-inner{overflow:hidden;width:100%;position:relative;}

lib/accordion.less

@@ -8,16 +8,19 @@
 .accordion-heading {
   padding: 5px 10px;
   border: 1px solid #ddd;
+  border-bottom: 0;
 }
 
 .accordion-body {
+  border-bottom: 1px solid #ddd;
   margin: 0 0 1px 0;
 }
 
 .accordion-inner {
   padding: 10px;
   border: 1px solid #ddd;
-  border-top: 0;
+  border-bottom: 0;
+  margin-bottom: 0;
 }
 
 .accordion .in {