This month, in Marketing Information Masters v. The Trustees of the California State University (full PDF of decision here), the US Dist. Ct. for the S. Dist. of Cal. found the Copyright Remedy Clarification Act to be unconstitutional for removing sovereign immunity for state workers working in their official capacity. The court determined that Congress exceeded its power under the 14th Amendment and that state employees retain immunity for copyright infringement.
See also Dear Professor: “You’ve Been Sued”
For more history, specifically the Puerto Rico case of De Romero v. Institute of Puerto Rican Culture, 2006 WL 3735352 (D.P.R. Dec. 15, 2006) in which the court also found that Congress exceeded its power under 14th Amendment, read this article by Prof. Patry, and the last paragraph of that case.