Okay, over the summer (not during the month when i'm thousands of miles from any computer) I want to undertake a project in perl to better help my understanding of the language, networks, and computers as a whole. I want to do something that I have never done before, using all new things that I will have to learn (obviously i'm going to spend quite some time here getting help from you guys).

I was thinking of writing a rudimentary internet security thing (blocking incoming connections and letting the user decide whether to let it through). I'm not looking to make something good by any stretch. This is for me, nobody else.

Does anyone have any good suggestions as to what kind of project to undertake, or even where to begin should I choose this one?

Thanks in advance.