I agree, I think of all my clinical experiences, actually working in the field was the best experience because you get an idea of what the practice of medicine in that area is really like, and you have a lot of exposure to different physicians and situations you can learn from. I think adcoms like to know that you're aware of the stressful, thankless, and frustrating aspects of practicing medicine and are still up for it. One of my friends was an ER tech, and I worked as a CA (the person who rooms ya and takes your BP, CC, history, etc.), and that gave us plenty to talk about in the 'clinical experience' portion of the interview. And it was good to be PAID. Shadowing is a good way to get a brief glimpse of many different things; I never did do any volunteering because I didn't find many medical opportunities, mostly paperwork and go-fer-ing.