my school is very pbl.
it can be frustrating and feels hit & miss at times, depending on your group or the facilitator.
however, we usually present something to our peers at least 3 times a week. this is a great way to learn. also, it helps develop excellent teamwork skills, and oh boy...some of us really need it! medicine is a huge field, so i had to learn to really filter myself...you can't present everything in 5-10 minutes...you need to hit the key points/concepts and move on. finally, i was shadowing a radiation oncologist once, and sat in on a tumor board meeting. and...it was very similar to a pbl session. the various physicians dealt with different personalities, stood up for their professional opinions, learned from others, and came to a reasonable decision on the patient's treatment. it wasn't pretty, but it worked. and the same goes for pbl...it's not always pretty, and sometimes feels like the biggest waste of time because let's face it, we can all go out, buy the book and understand the material. i was blown away at that tumor board...the whole point of pbl smacked me in the face.
oh, for the functional details...we have a couple of lectures a day and usually 2-3 pbl sessions per week. also, we have labs/conferences. conferences are larger group meetings where we discuss a certain topic, maybe go over a problem set or a case. yes, we dissect, look under the microscope, all that...but we spend less time in lecture, that's for sure. our pbl gropus are typically 6-8 people plus a facilitator. we have exams, usually 2 per 6-8 week block.