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Oracle Business Intelligence Enterprise Edition (OBIEE) 11g R1 (11.1.1.3) for Windows & Linux is now available to download from here
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High Level Steps to Install OBIEE 11g
Step 3 i.e. Install OBIEE Server will create MW_HOME (Middleware Home), WL_HOME (WebLogic Home), ORACLE_HOME (for BI Server), DOMAIN_HOME (runtime java component) and INTANCE_HOME (runtime system component) for more information various homes in Oracle Fusion Middleware here
For a detailed write-up on OBIEE 11g, check Mark Rittman’s post here