applied a patch from Adam, with a little modification.

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@10860 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/PluginWrapper.java

@@ -483,6 +483,14 @@ public final class PluginWrapper {
             return null;
         }
     }
+    
+    /**
+     * returns the {@link UpdateCenter.Plugin} object, or null.
+     */
+    public UpdateCenter.Plugin getInfo() {
+        UpdateCenter uc = Hudson.getInstance().getUpdateCenter();
+        return uc.getPlugin(getShortName());
+    }
 
     /**
      * Returns true if this plugin has update in the update center.

core/src/main/resources/hudson/PluginManager/installed.jelly

@@ -35,8 +35,17 @@
                         </a>
                       </j:when>
                       <j:otherwise>
-                        ${p.longName}
-                      </j:otherwise>
+	                      <j:choose>
+		                      <j:when test="${p.info!=null}">
+			                      <div>
+			                        <a href="${p.info.wiki}"><st:out value="${p.longName}"/></a>
+			                      </div>
+		                      </j:when>
+		                      <j:otherwise>
+		                        ${p.longName}
+		                      </j:otherwise>
+	                      </j:choose>
+	                  </j:otherwise>    
                     </j:choose>
                   </h4>
                   <div stlyle="padding-left: 1em">