hmm...well, i think you mean that feeling that you get when you think you should be doing something but you're not. Which is not the same as that itchy feeling you get in your spine when you're doing something tedious. If it's the itchy feelin then you have to go somewhere else, but the other one is distinctly different.

I had this problem rather recently. Found no fix for it. So, I did the next best thing. I rode someone else's inspiration. I went to sourceforge.net, filtered on perl projects, and picked one to join. I'm very happy now :) There already seems to be tons of projects out there that need help going.