If you're a developer and would like to enable the use of the Twitter Display's extra features, here is an overview of what to do.
These examples are presented in C#.


TO DISPLAY THE TIME OF A TWEET
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Your app is reponsible for calculating and building the string that describes when the tweet was sent.
Once you have that, you simply need to send it to the display in a custom atrribute:

            notification.CustomTextAttributes.Add("TIME", tweetTime);



TO DISPLAY THE REPLY BUTTON AND RESPOND TO IT
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First you need to enable the button on the display. This is similar to adding the time text:

            notification.CustomTextAttributes.Add("REPLY", "On");

Specifying "On" as the attribute value will enable the reply button.  If someone clicks on it, then the display will send back the following, which you can access and process in the Growl callback method:

            if (callbackContext != null)
            {
                if (callbackContext.Result == Growl.CoreLibrary.CallbackResult.CLICK)
                {
                    if (response.CustomTextAttributes.ContainsKey("Response"))
                    {
                        string r = response.CustomTextAttributes["Response"];

                        if (r == "REPLY")
                        {
                              // Process the reply request.
                        }
                    }
                }
            }

You can also do the same for two other buttons, "RETWEET" and "DMESSAGE".