This paper examines the potential of community health worker (CHW) programmes, as proposed by the WHO's 2008 Task shifting to tackle health worker shortages -Global recommendation and guidelines, to contribute to HIV/AIDS prevention, care and treatment and the achievement of various Millennium Development Goals in low income countries. It examines the WHO proposal through the lens of a literature review of factors that have facilitated the success of previous experiences of shifting tasks from health workers to trained lay people. The WHO has taken account of five key lessons learned from past CHW programmes (the need for strong management, appropriate CHW selection, suitable training, adequate retention and incentive structures, and good relationships with other healthcare workers). It has, however, neglected to emphasise the importance of the 'community embeddedness' of health volunteers, found to be of critical importance to the success of many past CHW programs. We have no doubt that the WHO Plans will increase the number of workers able to perform medically oriented tasks. However, we argue that without community embeddedness CHWs will be unable to perform the socially oriented tasks assigned to them by the WHO, such as health education and counseling. We locate the WHO's neglect of community-embeddedness within the context of a broader global public health trend away from community-focused primary health care towards biomedically-focused selective health care.