From ScienceBlogs’ Ed Brayton. The law states, in part:
36. Publication or utterance of blasphemous matter.
(1) A person who publishes or utters blasphemous matter shall be guilty of an offence and shall be liable upon conviction on indictment to a fine not exceeding €100,000. [Amended to €25,000]
(2) For the purposes of this section, a person publishes or utters blasphemous matter if (a) he or she publishes or utters matter that is grossly abusive or insulting in relation to matters held sacred by any religion, thereby causing outrage among a substantial number of the adherents of that religion, and (b) he or she intends, by the publication or utterance of the matter concerned, to cause such outrage.
(3) It shall be a defence to proceedings for an offence under this section for the defendant to prove that a reasonable person would find genuine literary, artistic, political, scientific, or academic value in the matter to which the offence relates.
Update: Atheist Ireland is organizing a campaign to repeal the law.