My teacher's teacher, Nguyen Van Nghi, MD, often said, "The research has already been done." We have a literate, scientific tradition in Asia going back more than 2,400 years. For those with a Western cultural bias, nothing in medicine is science until you try to prove that it doesn't work.
Because classical acupuncture is tailored to the individual patient, 100 people with the same Western disease-name are likely to get 100 different acupuncture treatment plans. This makes real acupuncture unsuited to ordinary Western-style research, where a group of patients are given a standardized treatment. Even so, acupuncture often looks good in Western-style studies. How much more effective when there is individualized treatment of the whole person?
A current search on "acupuncture" at the National Institutes of Health PubMed database yields more than 24,000 articles: http://www.ncbi.nlm.nih.gov/pubmed/?term=acupuncture
World Health Organization 1999 list, diseases treatable with acupuncture: WHO Review_p29-32
Full WHO report, 87 pages: ACUPUNCTURE: REVIEW AND ANALYSIS OF REPORTS ON CONTROLLED CLINICAL TRIALS