With some notable exceptions, the quality of evidence that many of these treatments work is much lower. It is an area where individuals will make their own minds up. All the main patient-focused health sites listed above have sections on and links to complementary and alternative therapies, as do the pharmacy sites. Both websites will find local practitioners and are packed with information about their respective fields. Both sites have lots of information about acupuncture.
Bandolier produces evidence-based assessments of conventional medicine as well.
Noah is the New York Online Access to Health, a joint project between the city's university, library and academy of medicine. It has a good section on alternative medicine, plus lots more on conventional therapies.