another go with tags

tags.html

@@ -0,0 +1,13 @@
+---
+layout: page
+title: Posts by tags
+permalink: /tags/
+---
+{% for tag in site.tags %}
+<h3>{{ tag[0] }}</h3>
+    <ul>
+            {% for post in tag[1] %}
+                <li><a href="{{ site.baseurl }}{{ post.url }}">{{ post.title }}</a></li>
+            {% endfor %}
+    </ul>
+{% endfor %}