Here's the first one that came up: [link|http://www.chiroweb.com/archives/13/19/19.html|Homeopathic Research Update]. Lots of references at the bottom.

I am also aware there are double blind tests of homeopathic remedies by allopathic researchers that came up statistically invalid. I imagine they tend to pick some of the more marginal claims to test, consciously or subconsciously, since that would be the natural tendency to assure you get the results you expect.