The Fireteam feature in ET is very useful. It allows you to create a team inside the Allied or Axis side.
It can help you then to unmask enemy covert ops.
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ESL starts ET-Ladder
The Electronic Sports League now provides an ET 6on6 Ladder in their list of German tournaments. I guess more ESL nations will follow soon.
Maybe you already know this great tool from RTCW. Now it is also available for ET. It can analyze all the stats of a match and publish them on a HTML page. An example can be found here.