The title of this question is not really clear, so let me rephrase this:
From time to time I stumble upon some piece of code or program of which I think: "Wow, this is incredible handy ! Such a pity that I only now find out that this exists..." . The problem here is that you can only find these things by accident because you didn't even know there was something to search for.
So what I'm wondering about, (How) Can I use Stack Exchange in such a way that it can just find the most interesting answers of the week without actually searching for answers for a specific question ?