National Cancer Institute: Pain during the final hours of life.  A nice review of pain; additional resources on many other aspects of end of life care.  

National Comprehensive Cancer Network, Cancer Pain Treatment Guidelines.  (requires free registration; very thorough review with many additional materials) 

AHCPR Clinical Practice Guideline:  Management of Cancer Pain, 1994.  Despite the date, this is still a very comprehensive and accurate review of the subject, cited often.  

Cochrane Pain, Palliative and Supportive Care Library (Clinical reviews – full text access through MSU Library e-Resources)  Evidence-based reviews of multiple treatments for pain and other  symptoms.

Easing Cancer Pain: An interactive Web site providing information on cancer pain relief to people with cancer and their families

Talaria: a resource for health care professionals: This site addresses the management of pain in patients with cancer. It provides a hypermedia implementation of the Clinical Practice Guideline on the Management of Cancer Pain, a publication of the Agency for Health Care Policy and Research.

Books

Berger AM, von Roenn JH, Shuster JL.  Principles and Practice of Palliative Care and Supportive Oncology. Lippincott, Williams & Wilkins, 2006

Bruera E, Higginson I, Ripamonti C, von Gunten D. Textbook of Palliative Medicine. Hodder Arnold, 2007

Cassell EJ. The Nature of Suffering and the Goals of Medicine.  Oxford University Press, 2002

Doyle D, Hanks G, Cherny N. Oxford Textbook of Palliative Medicine.  Oxford University Press, 2005  (available as MSU Library e-Resource) 

Ferrell B, Coyle N.  Textbook of Palliative Nursing.  Oxford University Press, 2006.  (available as MSU Library e-Resource)

Morrison RS, Meier D. Geriatric Palliative Care.  Oxford University Press, 2003 
Walsh TD, Foley KM, Glare P.  Palliative Medicine.  Mosby, Inc., 2008