New Scientist is carrying this article on what could be a new treatment for at least some forms of Huntington's disease. However, I thought "meets its match" was a bit of a sensational headline when I read this, buried deep in the article:

So far the experiments have only been carried out in cultured cells, and Davidson, who is collaborating with Sirna Therapeutics, a firm based in San Francisco, US, warns that it may be several years before the therapy is ready for testing in people. “We need to be careful and do good science, but we’re very optimistic,” she says.

The RNAi process apparently is also showing signs of being useful in the fight against Alzheimer's.