I wouldn't worry about this too much. Google does a good job when it comes to spotting the difference between you and these guys.

As far as serving junk content to that IP, its a waste of time. As your blog gets more popular you'll start getting more and more people ripping your content. The time you spend trying to beat these guys is better used elsewhere.

My advice, get a few high quality links going to your domain, this will come naturally over time. It will really let the search engines know which domain is the authority and which domains are just stealing content.