IP Addresses as private information?

For my semester project I have decided to focus on exploring if IP addresses are personal information (personally identifiable information) or fair game. Luckily I have chosen a topic which I have not fully made up my mind. So this paper will reflect my own curiosity in the matter and be, at least I hope, very balanced.

At the heart of my paper I am hoping to examing differing opinions on whether or not IP addresses are PI or not. To be followed by a comparitive analysis of US law relating to IP addresses and EU laws.

My searching is progressing, all be it slowly. For some reason now that I am actually looking for information on the topic, I cannot find very many quality works on the topic. How I wish I would have not deleted all those Google feeds.