Simon Singh is being sued for libel over an article (with references added by gimpy) he wrote for the Guardian. (The original article has been removed from the Guardian website - a cached copy can be found here thanks to Svetlana. Unity at Ministry of Truth has provided even more annotation in Can you libel Woo?)
Jack of Kent is following it from a legal angle. Holford Watch has an incredibly comprehensive list article with links to bloggers covering it.
Hopefully the lawsuit will fail and Simon will be vindicated.