In Ginsburg v. Philadelphia Stock Exchange, Inc., 2007 WL 2982238 (Del. Ch., Oct. 9, 2007), read opinion here,  the Chancery Court ruled that an objector to a proposed settlement of a class action is entitled to at least limited access to discovery already taken in the case, subject to a confidentiality order, so that the objector will be in a position to assess the fairness of and the detailed basis for the settlement.  Here  is a summary on this blog of a prior procedural decision in this case.