It seems that they have been overwhelmed by the usual heavy handed lawyer blather. http://www.mumsnet.com/lw/state.html
FWIW I don't think much of Gina Ford's "Contented Little Baby" methods, and I'm not surprised that people have bad things to say. The people who seem to be most negative are those who have tried it and found it didn't work for them.
The system seems to work for some people though (as will almost any system) and her followers tend to be very pasionate about it, almost religious. Even her web site described itself as "The ContentedBaby.com site is a community site for Gina Ford followers
" . . .
I don't know what the allegedly libellous comments were, and due to the intimidation of mumsnet.com I can't read them for myself. I suspect that Gina Ford needs to get over herself.