Hi everybody,
as there are a few people here whose native language is not English, I thought this book might help you: English for Doctors by Maria Györffy. A friend of mine said it helped him a lot to get his studies done in the USA. The book helps you develop language skills concerning history-taking, examination etc and covers all major medical specialties. There's also accompanying recorded material to learn pronounciation etc. The exercises are quite good and in step with actual practice.
To get an overview, look at:
http://medicalenglish.coursekey.com/
Hope I could help
bye
kenu