Finally, it's released. the main purpose of EM ( previously EM grid control and it is different with EM database control that released with DB 11g) is managing, control, analyze and maintenance all oracle and non-oracle (with plug-in) servers and application from one place. that means you can add Oracle application server, weblogic, DB 9i/10g/11g ( main release is 11gR1), ASM, Storage devices, etc... to EM11g. In additional oracle integrate customer support to this environment.
Oracle say EM11g is to support Business Driven Application Management! ( because of rapid control and change of today application bas on business changes and needs)