start talking about polymer.dart

src/site/articles/web-ui/tools.markdown

 ---
 layout: default
 title: Tools for Web UI
 description: "Tools for creating a project with Web UI"
 rel:
   author: sigmund-cherem
 ---
 
 # {{ page.title}}
 
+<aside class="alert alert-danger" markdown="1">
+<strong>Web UI is now Polymer.dart.</strong>
+Web UI has evolved to
+[Polymer.dart](/polymer-dart/), which contains many fixes and improvements.
+We encourage Web UI users to upgrade to Polymer.dart.
+The information on this page apply only to Web UI, which is now deprecated.
+</aside>
+
 _Written by Sigmund Cherem<br />
 October 2012 (Updated December 2012)_
 
 
 The Web UI package (Web UI for short) provides web components and templates to
 help you write web applications at scale. You can learn about this package in
 our [explainer article](/articles/web-ui/). This article describes tools that will help
 you create and deploy projects that use Web UI.
 
 {% include toc.html %}
@@ skipping 113 matching lines @@
 [Build.dart and the Dart Editor Build System](/tools/editor/build.html).
 
 
 [dwc]: https://github.com/dart-lang/web-ui/
 [extension]: http://dart-lang.github.com/web-ui/extension/web_ui.crx
 [dartium]: /tools/dartium/
 [editor]: /tools/editor/
 [dart2js]: /docs/dart-up-and-running/contents/ch04-tools-dart2js.html
 [mb]: /support/faq.html#what-browsers-supported
 [sd]: http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/shadow/index.html