How to create my own screenlet

How to create my own screenlet

I am using 1 year ubuntu as my main OS already and I feel comfortable with
the enviroment and the tools it provides. I also used one screenlet to
have my task manager or calendar on my desktop and have it connected
directly with google calendar in order to track my todos.
But now I would like to make my own screen-let since I can't find one that
will help me orgnize my stuff better, like a small little browser that
fetches some webdata, or load a small html client in a screenlet. I am not
sure how to start and I can't find any documentation on how to make my
own. I have found this post but the documentation does not seem to work
How do I write a Screenlet? Are screenlets dead and about to be
substituted by something else? I am using ubuntu 12.04 at the moment on an
Intel core I7.
thank you