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BMJ has learning resources that seem to fit my short attention span. I just did the hypertension module in about 8 minutes.
Good: It's a good, quick overview of common problems with a short quiz and references. It has a well done user interfact with a nice feature that tells you what your answer was on a given item and how other people answered. So if you're MUCH smarter or much stupider than everyone else .. you know.
Bad: I didn't learn anything new. I'll have to try another module when I have 8 minutes free sometime.