I've Been playing with Ant, Jenkins and MXUnit recently and when I run the build in eclipse i thought it would be nice if it could open up the test results for me.

Here's an ant macro to open a url in your default browser, only works on Windows though, sorry.

<macrodef name="openInBrowser">
   <attribute name="url"/>
   <sequential>
      <exec dir="${basedir}" executable="rundll32.exe">
         <arg line="url.dll, FileProtocolHandler"/>
         <arg line="@{url}"/>
      </exec>
   </sequential>     
</macrodef>

Then in the target you can call it

<target name="openTestResults">
   <echo message="Opening test results in default browser" />
   <openInBrowser url="http://${test.host}/tests/output/html/index.html"/>
</target>