On March 31, the United States Supreme Court issued a splintered 5-4 opinion governing the application of state laws in class actions brought in federal court based on diversity jurisdiction, Shady Grove Orthopedic Associates, P.A. v. Allstate Insurance Co., No. 08-1008 (Slip Opinion). Shady Grove could significantly curtail the application of state laws in federal diversity cases and could prompt more class action filings in federal court.