Ask HN: What skills do employers usually ask for in internships

I'm a computer science student and I am going to start looking for internships by this fall so I could start next January if I find any.

I'm wondering what technical skills employers usually look for in students. I definitely have no preference as to what specific field I get into right now but I see myself getting into the networking/data communications field in the future when I graduate.

I'm no genius nor a hotshot programmer, just the average joe who's very passionate about programming. I know a little about a lot of things (Java, C, C++, Python, Windows, Linux, etc) because I believe that I have my whole lifetime to master some or a few of those.

If you have any general advice regarding getting my first internship, by all means, please pitch in. Thanks!