As someone who knows very little about libel law, I was a bit worried by this article a couple of weeks ago in the Times about bloggers being sued for libel. Apparently our laws give us much less right to free speech than, for example in America; so suing for libel here is becoming increasingly popular for those able to afford it. Apparently it costs a fortune to defend yourself against such a claim. Why they can't be dealt with by a magistrate in half an hour is beyond me.
The author Simon Singh is being sued by the British Chiropractic Association, who claim to be able to treat children for various ailments such as asthma and colic by manipulating their spines. He wrote in the Guardian that there is no evidence for this claim and they decided to try and silence him.
Other examples include the website Bad Psychics who apparently received a legal threat from some disgruntled psychic and took down their offending article. (If a psychic threatens to take you to court then no doubt they know what the outcome will be, so it's probably best to back down.)
The Society of Homeopaths took exception to Andy Lewis' Quackometer website which investigates dubious medical practices and threatened him with a libel suit, which seems to have had more effect than their medicines.
If everyone I have written unfavourably about decides to sue me, then the courts will grind to a halt and I will have to flee the country and live where the idea of free speech is more valued. I could perhaps set myself up as a magnet therapist, but I'd probably attract the wrong sort of people...