IP Today has published an interesting report on permanent injunction decisions since the Supreme Court's 2006 decision in eBay v. MercExchange. The authors found 67 district court injunction decisions. 48 (72%) granted relief; 19 (28%) denied relief. The article highlights a number of cases where injunctive relief was denied even though the parties were market competitors. Unfortunately, the article does not indicate whether the parties were actually competing in the market influenced by the patent. (The article indicates that IMX v. LendingTree involves competitors.)
Ernest Grumbles, Rachel Hughey, and Susan Perera, The Three Year Anniversary of eBay v. MercExchange: A Statistical Analysis of Permanent Injunctions, Intellectual Property Today, November 2009 (behind a firewall).