I hope that will help someone (at least Nicolas M).
ITfsEventSubscriber.cs :
...
[ServiceContract(Namespace = "http://schemas.microsoft.com/TeamFoundation/2005/06/Services/Notification/03")]
public interface ITfsEventSubscriber
{
    [OperationContract(Action = "http://schemas.microsoft.com/TeamFoundation/2005/06/Services/Notification/03/Notify")]
    void Notify(String eventXml, String tfsIdentityXml); 
}
...
TfsEventSubscriber.cs :
...
public class TfsEventSubscriber : ITfsEventSubscriber
{
    void ITfsEventSubscriber.Notify(String eventXml, String tfsIdentityXml)
    {
        // My notify code
    }
}
...
Web.config :
...
<system.serviceModel>
    <bindings>
      <wsHttpBinding>
        <binding name="NoSecurity">
          <security mode="None">
          </security>
        </binding>
      </wsHttpBinding>
    </bindings>
    
    <services>
      <service behaviorConfiguration="WcfTfsDeployer.Behavior" name="WcfTfsDeployer.TfsEventSubscriber">
        <endpoint address="mex" binding="mexHttpBinding" contract="IMetadataExchange" />
        <endpoint address=""  binding="wsHttpBinding" bindingConfiguration="NoSecurity" contract="WcfTfsDeployer.ITfsEventSubscriber" />
      </service>
      
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="WcfTfsDeployer.Behavior">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="true"/>
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>
...
