This Simpson Thacher & Bartlett LLP memorandum discusses court decisions relating to contingent business interruption coverage in the wake of natural disasters, the impact of "other insurance" clauses in policies issued to a mutual insured, and the invalidity of a class action waiver in an arbitration clause. It also discusses rulings on subrogation, the non-transferability of insurance coverage, and coverage for Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) costs and faulty workmanship under general liability policies.