Most lecture and educational materials are the property of the authors. There are serious copyright laws that govern the reposting and use of materials that are not your property. I can tell you that when I put 40 hours into the preparation of one of my lectures on atherosclerosis (or another disease process), I am not interested in having those materials broadcast on the open internet. There are limits to what we may place on password in house websites such as Blackboard. I generally furnish no more than a syllabus and a handout. I have seen many of my colleagues lectures, photos and syllabi end up overseas as lesson plans for people who are not capable of producing their own materials.
The problem with Wikipedia is that it isn't a peer-reviewed journal or primary source. While much of the information is correct, it's not a reliable source for making patient care decisions. It may be quick but you have no reliable means of knowing how the material has been collected and produced. I do not allow Wikipedia as a primary source for any Evidence based decision-making on my rounds and service. If you bring me an answer, you have to have a peer-reviewed journal or source that you consulted for your answers.
I've thought off an on about this topic, and have a couple things to throw into the ring.
First, responding to njbmd, I know it is frustrating putting in a lot of time into something that others then snatch and use without a second thought. I've heard it happen many times over. At the same time, I think the rising generation of students has grown up with the internet (and has the additional liberal bump of youth). We are seeing inefficiencies in the system and are saying, "there must be a better way to do this!" We have some outstanding lecturers and some fantastic notes, but also some not so stellar performers. It would be ideal to somehow pool the educational material and let the cream rise to the top.
A major obstacle is the disparity in curricular structure from one school to another. Another is the pride of the lecturers that find their material is lacking. On the flip side it may spur them on to improve their materials or to collaborate with others who are doing superior work. One barrier I didn't think of initially is that a lot of lecturers do have material cropped from other sources. If this was published on an open website, the school would have legal issues with copyrights.
Ideally, there will be more schools opening their doors to those who wish to utilize their material. This would come with the common clause that the material is to be clearly credited and, of course, used purely for non-commercial purposes. A second layer would be built on top, with a portal for organizing and accessing these resources. In this portal, students would be able to rate the resources, give both positive and constructive feedback to the creators of the material, and leave comments about the usefulness for future users to see.
Student-generated material (e.g. review sheets, powerpoints, diagrams, etc) is already being disseminated in a similar fashion (
www.ustacks.com), and I think it will take off in coming years.
In the most extreme version of this scenario, multiple schools align their curricula and make available videotaped lectures. These lectures could be given by the best lecturers, and updated periodically. Students are expected to watch lectures/read material/etc on their own or in groups. And then each institution's faculty's time would be better spent on higher level synthesis of material, leading small groups, problem-solving, clinical cases, etc. I know there are those who learn better from listening in lecture, so I don't expect this to ever happen.
A nearer fantasy is for course syllabi to become wiki-ized, allowing students to fix typos, add clarifications, and suggest deletions. As in the wiki world, all changes are tracked and recorded (including who made the change), and prior versions are easily reverted to. Lecturers and course masters would have final say over any disputes. Parallel versions would be created -- a base outline format and a paragraph-style text. Then heading into each course, students could opt in/out for what they wanted printed (full text, outline, or not at all).
Which brings me to Wikipedia. I also don't think it should ever be cited as a primary source. Rather, it is useful as a quick summary and portal to other resources. In this way it is very similar to UpToDate, but with a broader scope and fewer details about specific clinical trials and recommendations. Wikipedia is extremely quick and easy to use, has proven invaluable for boards studying, and is quickly becoming a more reliable resource as more people contribute. I think it's enough for a lightning-fast question you need answered, but I agree that the primary papers are the foundation you need to rely on. I'd be interested to know what you all think of emedicine, as I feel it's an appropriate hybrid.
Enough procrastination -- back to the learning.