Qualifications for Summer Internships?

DMBeiler asks: "I'm a first year computer-science student, with a lot of computing background. I learned C++ in the curriculum here, but am also familiar with Perl, PHP, and know my way around Linux. I consider myself adept enough to pick up a working knowledge of a language fairly quickly. As an underclassman, with little formal training, do any jobs/internships exist for me, say, over the summer? What do I need to bring to the table to be considered for even a menial position, these days?"