The most important copyright challenge in decades will unfold in the U.S. Supreme Court next week [Tues. Mar. 29] with potentially enormous damages and the future of Internet innovation at stake. The entertainment industry is asking the justices to find Grokster and StreamCast -- makers and distributors of peer-to-peer software -- liable for "mind-boggling" infringement by their users. A cross-section of the tech industry, consumer groups, the Bush administration and academics have filed over 50 friend-of-the-court briefs.
Details here from the National Law Journal via Law.com.
UPDATE: Thanks to SCOTUSblog, here is a link to some 59 briefs filed in the case, and here is a handy PDF summary of the arguments in the briefs from Jonathan Band of MoFo (you may have to rotate the PDF counter-clockwise in Adobe Acrobat).