1. Weist's _Fundamentals of Emergency Radiology_ is the best "first read" rads book for medical students. ~$40 and you can read it in 2 or 3 evenings. It covers chest, abdomen & ortho and won't bog you down in things that you won't need as a student.
2. I'm definitely biased, but I think every 3rd year med student should go through The Wolf Files (demo on the link below).
Cheers.