Many feel the Common Rule treats an unwieldy range of activities identically under the monolithic label "human subjects research." Past objections centering on the conflation of biomedical and behavioral research have gained new currency with the increase in biobanking and Internet-based research. A more nuanced approach to research is overdue. Regulation will no doubt remain a major component of any new approach. But in some research contexts, investigators and subjects should be permitted to reach voluntary, informed agreements about certain aspects of their relationship.Consider the National Institutes of Health's new "Guidelines for Human Stem Cell Research."1 The guidelines owe their existence to the NIH's ..