There is new research showing that homeopathic solutions may be effective even though they've been diluted many times. The winner of the Nobel Prize in 2008, Prof. Luc Montagnier, reported that a series of rigorous experiments has demonstrated that electromagnetic properties remain in highly diluted biological samples. Dr. Montagnier is a French virologist who co-discovered HIV.
Homeopathy was not mentioned specifically in the paper but the process was similar because they used aqueous solutions that were agitated and serially diluted, noting that the strong agitation was critical for the generation of electromagnetic signals. Anyone familiar with homeopathy recognizes the traditional homeopathic distillation process.
A portion of the abstract of this research in part asserts, "A novel property of DNA is described: the capacity of some bacterial DNA sequences to induce electromagnetic waves at high aqueous (water) dilutions. It appears to be a resonance phenomenon triggered by the ambient electromagnetic background of very low frequency waves."
One of the major arguments against homeopathy in America has been that scientifically it's impossible for such dilutions to maintain any effect. This latest research would appear to counter that claim. Homeopathy is used extensively in Europe.
To learn more: Montagnier L, Aissa J, Ferris S, Montagnier J-L, Lavallee C (2009). Electromagnetic Signals Are Produced by Aqueous Nanostructures Derived from Bacterial DNA Sequences. Interdisciplinary Sciences: Computational Life Sciences, 1: 81-90.