Science author Simon Singh (who is speaking at the CFI London Science and Religion event in April) is being sued by the British Chiropractic Association (BCA).
The action is being taken over a passage in an article Singh wrote for the Guardian about the BCA.
The case was reported here by the Telegraph.
The excellent Jack of Kent sets out the alleged libel here.
This case is important because if the BCA wins there is a host of other alternative medical practitioners (homeopaths, etc.) who will probably also sue if it's suggested there's no evidence their treatment works.
If the case goes ahead, we'll see the evidence for and against the efficacy of chiropractice as a treatment for various ailments set out in court - which will be interesting!