I kind of disagree with the previous posts slightly. I think that it is kind of boring to present topics that have already been presented over and over and over by previous med students (i.e. approach to MI, CHF, etc).
I think that the Rational Clinical Examination series in JAMA has some excellent papers that are worth presenting. Most residents have just as crappy physical exam skills as medical students. These papers really shed light on proper technique, interreliability of maneuvers, and likelihood ratios of certain things that would surprise you.
An example would be the paper, "Does this Patient Have Aortic Regurgitation?". It not only explains the epidemiology, pathophysiology, etc., but it also explains proper technique and reviews things like pulse pressure, Hill sign, etc. In addition, it looks at the data and gives likelihood ratios to certain things that are talked about on the wards over and over. Turns out pulse pressure (based on available data) has a LR of around 1. Useless based on this paper, but mentioned on the wards a lot as something that is very suggestive of AI.
These papers are practical, useful, and full of information that most medical students have not presented before.