This is great! I have read in the Paul Rabinow edited edition of Ethics, Subjectivity and Truth, Vol. 1 of The Essential Works of Michel Foucault 1954-1984, some of Foucault’s ideas on Habermas (Rabinow was the Series editor and editor of Vol. 1. The New Press, 1997). In that interview, Foucault explains that he thinks Habermas has utopian ideas of society and that privileges communicative relations without adequately addressing power: “The idea that there could exist a state of communication that would allow games of truth to circulate freely, without any constraints or coercive effects, seems utopian to me. This is precisely a failure to see that power relations are not something that is bad in itself, that we have to break free of. I do not think that a soci- ety can exist without power relations, if by that one means the strate- gies by which individuals try to direct and control the conduct of others. The problem, then, is not to try to dissolve them in the utopia of com- pletely transparent communication but to acquire the rules of law, the management techniques, and also the morality, the ethos, the practice of the self, that will allow us to play these games of power with as little domination as possible” (298).
available here http://figuringoutmethods.wikispaces.com/file/view/Rabinow+-+Essential+Works+of+Foucault.pdf (Pg 298)
The Foucault/Habermas debate that never was