Research is yet another thing you can do to distinguish yourself, and attaining a publication is an accomplishment that people understand and can evaluate. It's a particularly favorable sign if you're going into academic medicine, where research will be an integral part of your future career; therefore, schools who pride themselves on placing their students into academic residencies then academic professorships, it's important. Is it the golden road to medical school? Probably not. The most important things you need to worry about are test scores and grades.
As far as automaton's insinuation that nurses and technicians don't do research, it's patently absurd. Most nurses and techs don't, for precisly the same reasons they went into the field in the first place -- it's not what they are about. But nursing research is an important field, and some of the most important research in such things as bedsores (a 5 billion dollar a year cost) and cross cultural communication are researched quite intensively at the research nursing schools. I know an echo tech who is often second author on major clinical research studies -- he's not 'just a tech', as they say. So don't let the MD get to your head before you get it -- medicine and research are both TEAM efforts, and if you're so darn set on being IN CHARGE, you're gonna hurt your team and ultimately the patient.
Anka